List of Diseases in Alphabetical Order

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Aberrant basal cell carcinoma
Abietic acid dermatitis
Acanthoma fissuratum (granuloma fissuratum, spectacle frame acanthoma)
Accessory nail of the fifth toe
Accessory tragus (ear tag, preauricular appendage, preauricular tag)
Acid-induced
Acne aestivalis (Mallorca acne)
Acne conglobata
Acne cosmetica (cosmetic acne)
Acne fulminans (acute febrile ulcerative acne)
Acne keloidalis nuchae (acne keloidalis, dermatitis papillaris capillitii, folliculitis keloidalis, folliculitis keloidis nuchae, nuchal keloid acne)
Acne mechanica
Acne medicamentosa
Acne miliaris necrotica (acne varioliformis)
Acne necrotica
Acne vulgaris
Acne vulgaris (acne simplex)
Acne with facial edema (solid facial edema)[nb 4]
Acquired generalized hypertrichosis (acquired hypertrichosis lanuginosa, hypertrichosis lanuginosa acquisita)
Acquired generalized lipodystrophy (Lawrence syndrome, Lawrence–Seip syndrome)
Acquired perforating dermatosis (acquired perforating collagenosis)
Acquired progressive lymphangioma (benign lymphangioendothelioma)
Acral arteriolar ectasia
Acral fibrokeratoma (acquired digital fibrokeratoma, acquired periungual fibrokeratoma)
Acral nevus (melanocytic nevus of acral skin, melanocytic nevus with intraepidermal ascent of cells)
Acral persistent papular mucinosis
Acrochordon (cutaneous papilloma, cutaneous tag, fibroepithelial polyp, fibroma molluscum, fibroma pendulum, papilloma colli, skin tag, soft fibroma, Templeton skin tag)
Acrodermatitis chronica atrophicans (Herxheimer disease, primary diffuse atrophy)
Acrodermatitis enteropathica
Acrodynia (calomel disease, erythredemic polyneuropathy, pink disease)
Acrogeria (Gottron syndrome)
Acrokeratosis paraneoplastica of Bazex (acrokeratosis neoplastica, Bazex syndrome)
Acrokeratosis verruciformis (acrokeratosis verruciformis of Hopf)
Acroosteolysis
Acrospiroma (clear cell hidradenoma, dermal duct tumor, hidroacanthoma simplex, nodular hidradenoma, poroma)
Acrylic monomer dermatitis
Actinic elastosis (solar elastosis)
Actinic keratosis (senile keratosis, solar keratosis)
Acute biphenotypic leukemia
Acute cutaneous lupus erythematosus
Acute eosinophilic leukemia
Acute generalized exanthematous pustulosis
Acute generalized exanthematous pustulosis (pustular drug eruption, toxic pustuloderma)
Acute lymphoblastic leukemia
Acute myeloid dendritic cell leukemia
Acute myeloid leukemia
Acute paronychia
Adams–Oliver syndrome
Adducted thumbs syndrome
Adenoid squamous cell carcinoma (pseudoglandular squamous cell carcinoma)
Adenoma sebaceum
Adhesive dermatitis
Adiposis dolorosa (Dercum's disease)
Adrenocortical carcinoma
Adult chest and abdomen with many red skin lesions
Adult forehead with scattered red pimples
Adult linear IgA disease
Adult male with a large, red, bulbous nose
Adult type of generalized eruption of cutaneous mastocytosis
Adverse reaction to biologic agents
Adverse reaction to cytokines
Aeromonas infection
African blackwood dermatitis
African cutaneous Kaposi sarcoma
African lymphadenopathic Kaposi sarcoma
African tick bite fever
Aggressive digital papillary adenocarcinoma (digital papillary adenocarcinoma, papillary adenoma)
Aggressive infantile fibromatosis
AIDS-associated Kaposi sarcoma
AIDS-related cancers
AIDS-related lymphoma
Ainhum (bankokerend, dactylolysis spontanea, sukhapakla)
Airbag dermatitis (airbag burn)
Albright's hereditary osteodystrophy
Alkali-induced
Allergic
Allopurinol hypersensitivity syndrome
Alopecia areata
Alopecia areata
Alopecia neoplastica
Alpha-1 antitrypsin deficiency panniculitis (alpha1-protease deficiency panniculitis, alpha1-proteinase deficiency panniculitis)
Alphavirus infection
Amelanotic blue nevus (hypomelanotic blue nevus)
American tick bite fever (Rickettsia parkeri infection)
Amniotic band syndrome (ADAM complex, amniotic band sequence, congenital constriction bands, pseudoainhum)
Anagen effluvium
Anal cancer
Anaplastic large cell lymphoma
Androgenic alopecia (androgenetic alopecia)
Anetoderma (anetoderma maculosa, anetoderma maculosa cutis, atrophia maculosa cutis, macular atrophy)
Angelman syndrome
Angiofibroma
Angioimmunoblastic T-cell lymphoma
Angiokeratoma
Angiokeratoma of Fordyce
Angiokeratoma of Fordyce (angiokeratoma of the scrotum and vulva)
Angiokeratoma of Mibelli (Mibelli's angiokeratoma, telangiectatic warts)
Angioleiomyoma (vascular leiomyoma)
Angiolipoleiomyoma
Angiolipoma
Angiolymphoid hyperplasia with eosinophilia (epithelioid hemangioma, histiocytoid hemangioma, inflammatory angiomatous nodule, inflammatory arteriovenous hemangioma, intravenous atypical vascular proliferation, papular angioplasia, pseudopyogenic granuloma)
Angioma serpiginosum
Angiosarcoma
Anhidrosis (hypohidrosis)
Annular erythema of infancy
Anonychia
Anticoagulant-induced skin necrosis
Anticonvulsant hypersensitivity syndrome
Antifungal agent-induced
Antimicrobial agent-induced
Apert syndrome (acrocephalosyndactyly)
Aplasia cutis congenita (cutis aplasia, congenital absence of skin, congenital scars)
Apocrine gland carcinoma
Apocrine nevus
Aponeurotic fibroma (calcifying aponeurotic fibroma, juvenile aponeurotic fibroma)
Apparent leukonychia
Appendix cancer
Arcanobacterium haemolyticum infection
Arsenic dermatitis
Arsenical keratosis
Arteriovenous fistula
Arthrogryposis–renal dysfunction–cholestasis syndrome
Arthropod assault
Artificial nail-induced
Astrocytoma
Asymmetric periflexural exanthem of childhood (unilateral laterothoracic exanthem)
Ataxia telangiectasia (Louis–Bar syndrome)
Atrichia with papular lesions (papular atrichia)
Atrophic actinic keratosis
Atrophic connective tissue panniculitis
Atrophoderma of Pasini and Pierini (dyschromic and atrophic variation of scleroderma, morphea plana atrophica, sclérodermie atrophique d'emblée)
Atrophodermia vermiculata (acne vermoulante, acne vermoulanti, atrophoderma reticulata symmetrica faciei, atrophoderma reticulatum, atrophoderma vermiculata, atrophoderma vermiculatum, atrophodermia reticulata symmetrica faciei, atrophodermia ulerythematosa, atrophodermie vermiculée des joues avec kératoses folliculaires, folliculitis ulerythema reticulata, folliculitis ulerythematous reticulata, folliculitis ulerythemosa, honeycomb atrophy, ulerythema acneforme, ulerythema acneiforme)
Atypical fibroxanthoma
Atypical lichen myxedematosus (intermediate lichen myxedematosus)
Atypical tuberous myxedema (Jadassohn–Dosseker syndrome)
Autoimmune estrogen dermatitis
Autoimmune polyendocrinopathy–candidiasis–ectodermal dystrophy syndrome
Autoimmune progesterone dermatitis
Autosensitization dermatitis
Axillary antiperspirant-induced
Axillary deodorant-induced
B virus infection
B-cell prolymphocytic leukemia
Baboon syndrome
Bacillary angiomatosis
Balanitis plasmacellularis (balanoposthitis chronica circumscripta plasmacellularis, balanitis circumscripta plasmacellularis, plasma cell balanitis, plasma cell vulvitis, vulvitis circumscripta plasmacellularis, Zoon's balanitis, Zoon's erythroplasia, Zoon's vulvitis)
Balloon cell nevus
Bannayan–Riley–Ruvalcaba syndrome
Barraquer–Simons syndrome (acquired partial lipodystrophy, cephalothoracic lipodystrophy, progressive lipodystrophy)
Bart syndrome
Basal cell carcinoma
Basal cell carcinoma
Basal-cell carcinoma
Basaloid follicular hamartoma
Basaloid squamous cell carcinoma
Bazex–Dupré–Christol syndrome (Bazex syndrome, follicular atrophoderma and basal cell cacinomas)
Beare–Stevenson cutis gyrata syndrome
Beau's lines
Becker's nevus
Becker's nevus (Becker's melanosis, Becker's pigmentary hamartoma, nevoid melanosis, pigmented hairy epidermal nevus)
Bejel (endemic syphilis)
Benign lipoblastomatosis (embryonic lipoma)
Benign melanocytic nevus (banal nevus, common acquired melanocytic nevus, mole, nevocellular nevus, nevocytic nevus)
Benign neonatal hemangiomatosis
Benign symmetric lipomatosis (benign symmetric lipomatosis of Launois–Bensaude, Madelung's disease)
Big toe with most of the toenail missing; only the nail's root is present
Birt–Hogg–Dubé syndrome
Black dermatographism
Bladder cancer
Blastomycosis-like pyoderma (pyoderma vegetans)
Blau syndrome
Blau syndrome
Bleaching cream-induced
Blepharochalasis
Blepharophyma
Blistering distal dactylitis
Blisters distributed over an adult forearm
Bloom syndrome (Bloom–Torre–Machacek syndrome)
Blue nails
Blue nevus (blue neuronevus, dermal melanocytoma, nevus bleu)
Blue nevus of Jadassohn–Tièche (common blue nevus, nevus ceruleus)
Blue rubber bleb nevus syndrome
Boston exanthem disease
Botryomycosis
Bovine papular stomatitis
Bowen's disease
Bowen's disease (squamous cell carcinoma in situ)
Bowenoid papulosis
Brainstem glioma
Branchial cyst (branchial cleft cyst)
Breast cancer
Breast eczema (nipple eczema)
Brill–Zinsser disease
Brittle hair–intellectual impairment–decreased fertility–short stature syndrome
Bromidrosis (apocrine bromhidrosis, fetid sweat, malodorous sweating, osmidrosis)
Bromoderma
Bronchial adenomas/carcinoids
Bronchogenic cyst
Brooke–Fordyce syndrome
Brucellosis (Bang's disease, Malta fever, undulant fever)
Bubble hair deformity
Bubonic plague
Buffalopox
Bullous drug reaction (bullous drug eruption, generalized bullous fixed drug eruption, multilocular bullous fixed drug eruption)
Bullous impetigo
Bullous lupus erythematosus
Bullous pemphigoid
Burkitt's lymphoma
Buschke–Ollendorff syndrome (dermatofibrosis lenticularis disseminata)
Butcher's wart
Calcinosis–Raynaud phenomenon–esophageal dysmotility–sclerodactyly–telangiectasia syndrome (CREST syndrome)
Cantú syndrome
Capillary aneurysms
Capillary hemangioma (infantile hemangioma, nevus maternus, strawberry hemangioma, strawberry nevus)
Capsaisin-induced
Carcinoid
Carcinoid tumor, gastrointestinal
Cardio-facio-cutaneous syndrome (cardiofaciocutaneous syndrome)
Carney complex (LAMB syndrome, NAME syndrome)
Cartilage–hair hypoplasia (McKusick type metaphyseal chondrodysplasia)
Cat scratch disease (cat scratch fever, English–Wear infection, inoculation lymphoreticulosis, subacute regional lymphadenitis)
Cavernous venous malformation
Cellular blue nevus
Cellulitis
Cellulitis
Central centrifugal cicatricial alopecia (follicular degeneration syndrome, pseudopelade of the central scalp)
Centrifugal abdominal lipodystrophy (centrifugal lipodystrophy, lipodystrophia centrifugalis abdominalis infantalis)
Centrofacial lentiginosis
Cerebellar astrocytoma
Cerebral astrocytoma
Cerebral dysgenesis–neuropathy–ichthyosis–keratoderma syndrome
Ceruminoma
Cervical cancer
Chancre
Chancroid (soft chancre, ulcus molle)
Chemical burn
Chemical burn
Chemotherapy-induced acral erythema (palmoplantar erythrodysesthesia syndrome)
Chemotherapy-induced hyperpigmentation
Cherry angioma (De Morgan spot, senile angioma)
Chevron nail (herringbone nail)
Chikungunya fever
Chilblain lupus erythematosus (chilblain lupus erythematosus of Hutchinson)
Childhood dermatomyositis
Childhood discoid lupus erythematosus
Childhood linear IgA disease (chronic bullous disease of childhood)
Childhood systemic lupus erythematosus
Childhood tumor syndrome
Chlamydial infection
Chloracne
cholangiocarcinoma
Chondrodermatitis nodularis chronica helicis
Chondrodermatitis nodularis chronica helicis (chondrodermatitis nodularis helicis)
Chondrodysplasia punctata
Chondroid lipoma
Chondrosarcoma
Chordoma
Chrome dermatitis
Chromhidrosis (colored sweat)
Chromobacteriosis infection
Chronic erythema nodosum
Chronic erythema nodosum (erythema nodosum migrans, subacute migratory panniculitis of Vilanova and Piñol, subacute nodular migratory panniculitis)
Chronic infantile neurologic cutaneous and articular syndrome
Chronic lymphangitis
Chronic lymphocytic leukemia
Chronic myelogenous leukemia
Chronic paronychia
Chronic recurrent erysipelas
Chronic scar keratosis (chronic cicatrix keratosis)
Chronic undermining burrowing ulcers (Meleney gangrene)
Chronic vesiculobullous hand eczema
Cicatricial alopecia
Cicatricial basal cell carcinoma (morpheaform basal cell carcinoma, morphoeic basal cell carcinoma)
Cicatricial junctional epidermolysis bullosa
Cicatricial pemphigoid (benign mucosal pemphigoid, benign mucous membrane pemphigoid, ocular pemphigus, scarring pemphigoid)
Ciliated cyst of the vulva (cutaneous Müllerian cyst, paramesonephric mucinous cyst of the vulva)
Circular coin-sized bare patch on the back of a person's scalp
Circumostomy eczema
Classic Kaposi sarcoma
Clear cell acanthoma (acanthome cellules claires of Degos and Civatte, Degos acanthoma, pale cell acanthoma)
Clear cell squamous cell carcinoma (clear cell carcinoma of the skin)
Clonal seborrheic keratosis
Close-up view of an adult eyelid on which there are numerous small, elevated skin lesions filled with white material
Clothing-induced
Clubbing (drumstick fingers, Hippocratic fingers, watch-glass nails)
Cobalt dermatitis
Cockayne syndrome
Cold panniculitis (popsicle panniculitis)
Collagenous fibroma (desmoplastic fibroblastoma)
Colobomas of the eye–heart defects–ichthyosiform dermatosis–mental retardation–ear defects syndrome (CHIME syndrome, Zunich neuroectodermal syndrome, Zunich–Kaye syndrome)
Colon cancer
Common seborrheic keratosis (basal cell papilloma, solid seborrheic keratosis)
Complement deficiency syndromes
Composite hemangioendothelioma
Condylomata acuminata
Condylomata lata
Congenital cartilaginous rest of the neck (cervical accessory tragus, wattle)
Congenital erosive and vesicular dermatosis
Congenital generalized lipodystrophy (Berardinelli–Seip syndrome)
Congenital hemidysplasia with ichthyosiform erythroderma and limb defects syndrome (CHILD syndrome)
Congenital hypertrophy of the lateral fold of the hallux
Congenital lip pit (congenital sinus of the lower lip, lip sinus, midline sinus of the upper lip)
Congenital malformations of the dermatoglyphs
Congenital melanocytic nevus
Congenital onychodysplasia of the index fingers
Congenital rubella syndrome
Congenital smooth muscle hamartoma
Connective tissue nevus (collagenoma, elastoma, shagreen patch)
Conradi–Hünermann syndrome (Conradi–Hünermann–Happle syndrome, Happle syndrome, X-linked dominant chondrodysplasia punctata)
Contact stomatitis (contact lichenoid reaction, lichenoid amalgam reaction, oral mucosal cinnamon reaction)
Contact urticaria
Corticosteroid-induced
Cosmetic dermatitis
Cosmetic intolerance syndrome
Costello syndrome
Cowden syndrome (Cowden's disease, multiple hamartoma syndrome)
Cowpox
Craniosynostosis–anal anomalies–porokeratosis syndrome
Cronkhite–Canada syndrome
Crouzon syndrome
Cutaneous actinomycosis
Cutaneous anthrax infection
Cutaneous C. diphtheriae infection (Barcoo rot, diphtheric desert sore, septic sore, Veldt sore)
Cutaneous ciliated cyst
Cutaneous columnar cyst
Cutaneous endometriosis
Cutaneous focal mucinosis
Cutaneous group B streptococcal infection
Cutaneous horn (Cornu cutaneum)
Cutaneous lupus mucinosis (papular and nodular mucinosis in lupus erythematosus, papular and nodular mucinosis of Gold, papulonodular mucinosis in lupus erythematosus)
Cutaneous meningioma (heterotopic meningeal tissue, rudimentary meningocele)
Cutaneous myelofibrosis
Cutaneous myxoma
Cutaneous Pasteurella hemolytica infection
Cutaneous Streptococcus iniae infection
Cutaneous T-cell lymphoma
Cutis laxa (chalazoderma, dermatochalasia, dermatolysis, dermatomegaly, generalized elastolysis, generalized elastorrhexis, pachydermatocele)
Cutis marmorata telangiectatica congenita (congenital generalized phlebectasia, Van Lohuizen syndrome)
Cutis rhomboidalis nuchae
Cutis verticis gyrata
Cystic basal cell carcinoma
Cystic lymphatic malformation
Cytomegalic inclusion disease
Cytophagic histiocytic panniculitis
Darier's disease (Darier–White disease, dyskeratosis follicularis, keratosis follicularis)
Dark area of skin, reminiscent of a bruise, on the inner ankle of an adult
Deep penetrating nevus
Dengue (Break-bone fever)
Dentifrice-induced
Dermal dendrocyte hamartoma
Dermal eccrine cylindroma (cylindroma)
Dermatitis from metals and metal salts
Dermatitis gangrenosa (gangrene of the skin)
Dermatitis herpetiformis (Duhring disease)
Dermatofibroma (benign fibrous histiocytoma, dermal dendrocytoma, fibrous dermatofibroma, fibrous histiocytoma, fibroma simplex, histiocytoma, nodular subepidermal fibrosis, sclerosing hemangioma)
Dermatofibrosarcoma protuberans
Dermatomyositis
Dermatosis papulosa nigra
Dermoid cyst
DeSanctis–Cacchione syndrome
Desmoid tumor
Desmoplastic trichoepithelioma
Diffuse cutaneous mastocytosis
Diffuse infantile fibromatosis
Diffuse large B-cell lymphoma
Diffuse neonatal hemangiomatosis
Dilated pore (dilated pore of Winer)
Discrete papular lichen myxedematosus
Disseminate and recurrent infundibulofolliculitis
Disseminated herpes zoster
Disseminated superficial actinic porokeratosis
Disseminated superficial porokeratosis
Dolichol kinase deficiency
Dominant dystrophic epidermolysis bullosa
Drug-induced acne
Drug-induced angioedema
Drug-induced lichenoid reaction (drug-induced lichen planus, lichenoid drug eruption)
Drug-induced lipodystrophy
Drug-induced lupus erythematosus
Drug-induced nail changes
Drug-induced pigmentation
Drug-induced pseudolymphoma
Drug-induced urticaria
Drug-related gingival hyperplasia
Dupuytren's contracture (Dupuytren's diathesis, Dupuytren's disease, palmar fibromatosis)
Dust-induced
Dyshidrosis (acute vesiculobullous hand eczema, cheiropompholyx, dyshidrotic eczema, pompholyx, podopompholyx)
Dyskeratosis congenita (Zinsser–Cole–Engman syndrome)
Dysplastic nevus (atypical mole, atypical nevus, B-K mole, Clark's nevus, dysplastic melanocytic nevus, nevus with architectural disorder)
Dysplastic nevus syndrome (B-K mole syndrome, familial atypical multiple mole–melanoma syndrome, familial melanoma syndrome)
Dystrophic epidermolysis bullosa
Ear eczema
Eccrine angiomatous hamartoma
Eccrine carcinoma (syringoid carcinoma)
Eccrine mucinosis
Eccrine nevus
Ecthyma
Ecthyma gangrenosum
Ectodermal dysplasia
Ectodermal dysplasia with corkscrew hairs
Ectrodactyly–ectodermal dysplasia–cleft syndrome (EEC syndrome, split hand–split foot–ectodermal dysplasia–cleft syndrome)
Eczema herpeticum (Kaposi's varicelliform eruption)
Eczema vaccinatum
Eczema vaccinatum
Ehlers–Danlos syndrome (cutis hyperelastica, elastic skin, India rubber skin)
Ehrlichiosis ewingii infection
Elastofibroma dorsi
Elastosis perforans serpiginosa
Elephantiasis nostras
Encephalocele
Endemic pemphigus (endemic pemphigus foliaceus, fogo selvagem)
Endemic typhus (murine typhus)
Endometrial cancer
Endovascular papillary angioendothelioma (Dabska tumor, Dabska-type hemangioendothelioma, hobnail hemangioendothelioma, malignant endovascular papillary angioendothelioma, papillary intralymphatic angioendothelioma)
Eosinophilia–myalgia syndrome
Eosinophilic cellulitis (Wells' syndrome)
Eosinophilic fasciitis (Shulman's syndrome)
Eosinophilic granuloma
Eosinophilic granulomatosis with polyangiitis (Churg–Strauss syndrome, allergic granulomatosis)
Eosinophilic pustular folliculitis of infancy (eosinophilic pustular folliculitis in infancy, infantile eosinophilic pustular folliculitis, neonatal eosinophilic pustular folliculitis)
Eosinophilic ulcer of the oral mucosa
Eosinophilic ulcer of the oral mucosa (eosinophilic ulcer of the tongue, Riga–Fede disease, traumatic eosinophilic granuloma)
Eosinophilic vasculitis
Ependymoma
Ephelis (freckle)
Epidemic typhus (epidemic louse-borne typhus)
Epidermal cyst (epidermal inclusion cyst, epidermoid cyst, infundibular cyst, keratin cyst)
Epidermal nevus syndrome (Feuerstein and Mims syndrome, Solomon's syndrome)
Epidermodysplasia verruciformis
Epidermolysis bullosa acquisita
Epidermolysis bullosa herpetiformis (Dowling–Meara epidermolysis bullosa simplex)
Epidermolysis bullosa simplex
Epidermolysis bullosa simplex of Ogna
Epidermolysis bullosa simplex with mottled pigmentation
Epidermolysis bullosa simplex with muscular dystrophy
Epidermolytic acanthoma
Epidermolytic hyperkeratosis (bullous congenital ichthyosiform erythroderma, bullous ichthyosiform erythroderma)
Epithelioid blue nevus
Epithelioid cell histiocytoma
Epithelioid hemangioendothelioma
Epithelioid sarcoma
Epithelioma cuniculatum (Ackerman tumor, carcinoma cuniculatum)
Epoxy resin dermatitis
Erosive pustular dermatitis of the scalp (erosive pustular dermatosis of the scalp)
Eruptive pseudoangiomatosis
Eruptive vellus hair cyst
Erysipelas
Erysipelas (ignis sacer, Saint Anthony's fire)
Erysipeloid of Rosenbach
Erythema gyratum repens (Gammel's disease)
Erythema infectiosum (fifth disease, slapped cheek disease)
Erythema marginatum
Erythema migrans (erythema chronicum migrans)
Erythema multiforme
Erythema multiforme major (erythema multiforme minor–erythema multiforme von Hebra)
Erythema multiforme minor (herpes simplex-associated erythema multiforme)
Erythema palmare
Erythema toxicum neonatorum (erythema toxicum, toxic erythema of the newborn)
Erythrasma
Erythrodermic mastocytosis
Erythrokeratodermia with ataxia (Giroux–Barbeau syndrome)
Erythromelanosis follicularis faciei et colli
Erythroplasia of Queyrat
Erythrotelangiectatic rosacea (erythematotelangiectatic rosacea, vascular rosacea)
Esophageal cancer
Ethylenediamine-induced
Ewing's sarcoma
Exanthem of primary HIV infection (acute retroviral syndrome)
Excessive scar tissue along an adult jawline
Excoriated acne (acne excoriée des jeunes filles, Picker's acne)[nb 5]
External otitis
External otitis (otitis externa, swimmer's ear)
Extragonadal germ cell tumor
Extrahepatic bile duct cancer
Extramammary Paget's disease
Extraskeletal chondroma (chondroma of soft parts)
Exudate over a background of redness on the external ear canal of an adult
Exudative hyponychial dermatitis
Eye makeup-induced
Eyelid dermatitis
Factitial panniculitis
Familial benign chronic pemphigus (familial benign pemphigus, Hailey–Hailey disease)
Familial cold urticaria (familial cold autoinflammatory syndrome)
Familial Mediterranean fever
Familial myxovascular fibromas
Familial partial lipodystrophy (Köbberling–Dunnigan syndrome)
Fanconi syndrome (familial pancytopenia, familial panmyelophthisis)
Farmyard pox
Fascial hernia
Felon
Fiberglass dermatitis
Fibrodysplasia ossificans progressiva
Fibroepithelioma
Fibroepithelioma of Pinkus
Fibrofolliculoma
Fibroma of tendon sheath
Fibromatosis colli (sternomastoid tumor of infancy)
Fibrous hamartoma of infancy
Fibrous papule of the nose (benign solitary fibrous papule, fibrous papule of the face)
Fixed drug reaction
Flea-borne spotted fever
Flinders Island spotted fever
Flower-induced
Flying squirrel typhus
Focal dermal hypoplasia (Goltz syndrome)
Focal facial dermal dysplasia
Folded skin with scarring (Michelin tire baby syndrome)
Follicular atrophoderma
Follicular hybrid cyst (Hybrid cyst)
Follicular lymphoma
Follicular mucinosis (alopecia mucinosa, mucinosis follicularis, Pinkus' follicular mucinosis, Pinkus' follicular mucinosis–benign primary form)
Folliculitis
Folliculitis decalvans
Folliculitis nares perforans
Folliculosebaceous cystic hamartoma
Folliculosebaceous-apocrine hamartoma (follicular-apocrine hamartoma)
Fordyce's spot
Fordyce's spot (Fordyce's disease)
Formaldehyde-induced
Formaldehyde-releasing agent-induced
Fournier gangrene (Fournier gangrene of the penis or scrotum)
Fox–Fordyce disease
Fragrance-induced
Franceschetti–Klein syndrome (mandibulofacial dysostosis)
Frontal fibrosing alopecia
Frontal image of a child's face showing large hyperkeratotic papules and plaques with some induration suspicious for actinic keratoses and early squamous cell carcinomas
Frontal linear scleroderma
Frontal linear scleroderma (en coup de sabre, morphea en coup de sabre)
Furunculosis (boil)
Gallbladder cancer
Ganglion cyst
Ganglioneuroma
Gardner's syndrome (familial colorectal polyposis)
Gas gangrene (clostridial myonecrosis, myonecrosis)
Gastric (stomach) cancer
Gastrocutaneous syndrome
Gastrointestinal carcinoid tumor
Gastrointestinal stromal tumor (GIST)
Generalized atrophic benign epidermolysis bullosa
Generalized congenital hypertrichosis (congenital hypertrichosis lanuginosa)
Generalized discoid lupus erythematosus
Generalized epidermolysis bullosa simplex (Koebner variant of generalized epidermolysis bullosa simplex)
Generalized eruptive keratoacanthoma (generalized eruptive keratoacanthoma of Grzybowski)
Generalized erythema
Generalized hyperhidrosis
Generalized lentiginosis
Generalized morphea
Generalized trichoepithelioma
Generalized vaccinia
Genital herpes (herpes genitalis, herpes progenitalis)
Genital leiomyoma (dartoic leiomyoma)
Gestational trophoblastic tumor
Gianotti–Crosti syndrome (infantile papular acrodermatitis, papular acrodermatitis of childhood, papulovesicular acrolocated syndrome)
Giant axonal neuropathy with curly hair
Giant cell fibroblastoma
Giant cell tumor of the tendon sheath (giant cell synovioma, localized nodular tenosynovitis, pigmented villonodular synovitis)
Giant condyloma acuminatum (Buschke–Löwenstein tumor, giant condyloma of Buschke–Löwenstein tumor)
Giant pigmented nevus (bathing trunk nevus, congenital nevomelanocytic nevus, garment nevus, giant hairy nevus, nevus pigmentosus et pilosus)
Giant solitary trichoepithelioma
Gingival fibromatosis with hypertrichosis
Glanders (equinia, farcy, malleus)
Glandular rosacea
Glioma
Glomeruloid hemangioma
Glomus tumor (glomangioma, solid glomus tumor, solitary glomus tumor)
Gnathophyma
Gold dermatitis
Gonococcemia (arthritis–dermatosis syndrome, disseminated gonococcal infection)
Gonorrhea (clap)
Gouty panniculitis
Graham-Little syndrome
Gram-negative folliculitis
Gram-negative rosacea
Gram-negative toe web infection
Granular cell tumor (Abrikossoff's tumor, Abrikossov's tumor, granular cell myoblastoma, granular cell nerve sheath tumor, granular cell schwannoma)
Granuloma faciale
Granuloma inguinale (Donovanosis, granuloma genitoinguinale, granuloma inguinale tropicum, granuloma venereum, granuloma venereum genitoinguinale, lupoid form of groin ulceration, serpiginous ulceration of the groin, ulcerating granuloma of the pudendum, ulcerating sclerosing granuloma)
Granulomatous facial dermatitis
Granulomatous perioral dermatitis
Granulosis rubra nasi
Green nail syndrome
Green nails
Group JK Corynebacterium sepsis
Grover's disease
Grover's disease (benign papular acantholytic dermatosis, persistent acantholytic dermatosis, transient acantholytic dermatosis)
Gustatory hyperhidrosis
Haber syndrome
Haemophilus influenzae cellulitis
Hair bleach-induced
Hair casts (pseudonits)
Hair dye-induced
Hair follicle nevus (vellus hamartoma)
Hair lotion-induced
Hair spray-induced
Hair straightener-induced
Hair tonic-induced
Hairy cell leukemia
Hairy cell leukemia
Hairy palms and soles
Half and half nails (Lindsay's nails)
Hallerman–Streiff syndrome
Halo nevus (leukoderma acquisitum centrifugum, perinevoid vitiligo, Sutton nevus)
Halogen acne
Halogenoderma
Hamartoma
Hand eczema
Hand-foot-and-mouth disease
Hangnail
Hapalonychia
Harlequin-type ichthyosis (harlequin baby, harlequin fetus, harlequin ichthyosis, ichthyosis congenita, ichthyosis congenita gravior)
Hay–Wells syndrome (AEC syndrome, ankyloblepharon filiforme adnatum–ectodermal dysplasia–cleft palate syndrome, ankyloblepharon–ectodermal defects–cleft lip and palate syndrome, ankyloblepharon–ectodermal dysplasia–clefting syndrome)
Head and neck cancer
Heart cancer
Heck's disease (focal epithelial hyperplasia)
Helicobacter cellulitis
Hemangiopericytoma
Hemangiosarcoma
Hematidrosis
Hemihyperplasia–multiple lipomatosis syndrome
Hemorrhagic fever with renal syndrome
Heparin necrosis
Hepatitis B
Hepatitis C
Hepatocellular cancer
Hepatosplenic T-cell lymphoma
Hereditary sclerosing poikiloderma
Herpangina
Herpes gladiatorum (scrum pox)
Herpes simplex
Herpes zoster oticus (Ramsay–Hunt syndrome)
Herpetic keratoconjunctivitis
Herpetic sycosis
Herpetic whitlow
Heterochromia iridum
Hibernoma (fetal lipoma, lipoma of embryonic fat, lipoma of immature adipose tissue)
Hidradenitis suppurativa (acne inversa, pyoderma fistulans significa, Verneuil's disease)
Hidradenocarcinoma
Hidradenoma
Hidradenoma
Hidrocystoma (cystadenoma, Moll's gland cyst, sudoriferous cyst)
Hirsutism
HIV disease-related drug reaction
HIV-associated lipodystrophy[nb 8]
HIV-associated pruritus
Hodgkin's lymphoma
Holocarboxylase synthetase deficiency
Homocystinuria
Hook nail
Hori's nevus (acquired bilateral nevus of Ota-like macules)
Hospital furunculosis
Hot comb alopecia
Hot tub folliculitis (Pseudomonas aeruginosa folliculitis)
Houseplant-induced
Human granulocytotropic anaplasmosis
Human monkeypox
Human monocytotropic ehrlichiosis
Human T-lymphotropic virus 1 infection
Human tanapox
Hutchinson's teeth
Hydrocarbon keratosis (pitch keratosis, tar keratosis, tar wart)
Hydrocarbon-induced
Hydroxyurea dermopathy
Hyper-IgD syndrome[nb 7]
Hypereosinophilia
Hypereosinophilic syndrome
Hyperkeratosis lenticularis perstans (Flegel's disease)
Hyperkeratosis of the nipple and areola
Hyperkeratotic actinic keratosis
Hyperkeratotic cutaneous capillary-venous malformation
Hyperkeratotic hand dermatitis
Hypertrichosis cubiti (hairy elbow syndrome)
Hypertrichosis simplex of the scalp
Hypertrophic scar
Hypohidrotic ectodermal dysplasia (anhidrotic ectodermal dysplasia, Christ–Siemens–Touraine syndrome)
Hypopharyngeal cancer
Hypotrichosis–acro-osteolysis–onychogryphosis–palmoplantar keratoderma–periodontitis syndrome
Hypotrichosis–lymphedema–telangiectasia syndrome
Ichthyosis bullosa of Siemens (ichthyosis exfoliativa)
Ichthyosis follicularis (ichthyosis follicularis with alopecia and photophobia syndrome)
Ichthyosis hystrix (ichthyosis hystrix gravior type Lambert, porcupine man, systematized verrucous nevus)
Ichthyosis hystrix of Curth–Macklin
Ichthyosis linearis circumflexa
Ichthyosis prematurity syndrome
Ichthyosis vulgaris (autosomal dominant ichthyosis, ichthyosis simplex)
Ichthyosis with confetti
Ichthyosis–brittle hair–impaired intelligence–decreased fertility–short stature syndrome (IBIDS syndrome, sulfur-deficient brittle hair syndrome, Tay's syndrome, trichothiodystrophy, trichothiodystrophy with ichthyosis)
Id reaction (disseminated eczema, generalized eczema)
Idiopathic facial aseptic granuloma
IgA pemphigus
Immune dysfunction–polyendocrinopathy–enteropathy–X-linked syndrome
Immune reconstitution inflammatory syndrome (immune recovery syndrome)
Immunosuppression-associated Kaposi sarcoma
Impetigo contagiosa
Incontinentia pigmenti (Bloch–Siemens syndrome, Bloch–Sulzberger disease, Bloch–Sulzberger syndrome)
Incontinentia pigmenti achromians (hypomelanosis of Ito)
Infantile acne
Infantile digital fibromatosis (inclusion body fibromatosis, infantile digital myofibroblastoma, Reye tumor)
Infantile hemangiopericytoma (congenital hemangiopericytoma)
Infantile myofibromatosis (congenital generalized fibromatosis, congenital multicentric fibromatosis)
Infantile systemic hyalinosis (juvenile systemic hyalinosis)
Infectious mononucleosis (glandular fever)
Infiltrative basal cell carcinoma
Inflammatory Breast Cancer
Inflammatory linear verrucous epidermal nevus
Inflammatory skin lesions following zoster infection (isotopic response)
Inherited patterned lentiginosis in black persons
Injection site reaction
Ink spot lentigo (sunburn lentigo)
Intermittent hair–follicle dystrophy
Interstitial granulomatous dermatitis
Intradermal spindle cell lipoma
Intraepidermal neutrophilic IgA dermatosis
Intrauterine epidermal necrosis
Intrauterine herpes simplex
Intravascular large B-cell lymphoma
Intravascular papillary endothelial hyperplasia (Masson's hemangio-endotheliome vegetant intravasculaire, Masson's lesion, Masson's pseudoangiosarcoma, Masson's tumor, papillary endothelial hyperplasia)
Invasive cribriform carcinoma
Invasive lobular carcinoma
Inverted follicular keratosis
Involutional lipoatrophy
Iododerma
Irritant diaper dermatitis (diaper dermatitis, napkin dermatitis)
Irritant folliculitis
Irritated seborrheic keratosis (basosquamous cell acanthoma, inflamed seborrheic keratosis)
Islet cell carcinoma (endocrine pancreas)
Isthmicoma (infundibuloma, tumor of the follicular infundibulum)
Itchy red bump disease (papular dermatitis)
Jadassohn–Pellizzari anetoderma
Jaffe–Campanacci syndrome
Japanese spotted fever
Johanson–Blizzard syndrome
Johnson–McMillin syndrome
Joubert syndrome
Junctional epidermolysis bullosa
Junctional epidermolysis bullosa gravis (epidermolysis bullosa letalis, Herlitz disease, Herlitz epidermolysis bullosa, Herlitz syndrome, lethal junctional epidermolysis bullosa)
Junctional epidermolysis bullosa with pyloric atresia
Juvenile hyaline fibromatosis (fibromatosis hyalinica multiplex juvenilis, Murray–Puretic–Drescher syndrome)
Juvenile myelomonocytic leukemia
Juvenile plantar dermatosis (atopic winter feet, dermatitis plantaris sicca, forefoot dermatitis, moon-boot foot syndrome, sweaty sock dermatitis)
Juvenile rheumatoid arthritis (juvenile idiopathic arthritis, Still's disease)
Juvenile xanthogranuloma
Kabuki syndrome (Kabuki makeup syndrome, Niikawa–Kuroki syndrome)
Kaposi sarcoma
Kaposi sarcoma
Kaposi sarcoma
Kaposiform hemangioendothelioma (infantile kaposiform hemangioendothelioma)
Kasabach–Merritt syndrome (hemangioma with thrombocytopenia)
Keloid
Keloid (Keloidal scar)
Keloid morphea
Keratin implantation cyst
Keratinizing metaplasia
Keratoacanthoma
Keratoacanthoma centrifugum marginatum
Keratocyst
Keratolytic winter erythema (erythrokeratolysis hiemalis, Oudtshoorn disease, Oudtshoorn skin)
Keratosis follicularis spinulosa decalvans (Siemens-1 syndrome)
Keratosis linearis with ichthyosis congenital and sclerosing keratoderma syndrome
Keratosis pilaris
Keratosis pilaris
Keratosis pilaris atrophicans
Keratosis pilaris atrophicans faciei (folliculitis rubra, keratosis pilaris rubra atrophicans faciei, lichen pilare, lichen pilaire ou xerodermie pilaire symmetrique de la face', ulerythema ophryogenes, xerodermi pilaire symmetrique de la face)
Kimura's disease
Kindler syndrome (acrokeratotic poikiloderma, bullous acrokeratotic poikiloderma of Kindler and Weary, congenital poikiloderma with blisters and keratoses, congenital poikiloderma with bullae and progressive cutaneous atrophy, hereditary acrokeratotic poikiloderma, hyperkeratosis–hyperpigmentation syndrome, Weary–Kindler syndrome)
Kinking hair (acquired progressive kinking)
Klinefelter syndrome
Klippel–Feil syndrome
Klippel–Trenaunay syndrome (angioosteohypertrophy syndrome, hemangiectatic hypertrophy)
Knuckle pads (heloderma)
Koenen's tumor (Koenen's periungual fibroma, periungual fibroma)
Koilonychia (spoon nails)
Kyrle disease
Lacquer dermatitis (lacquer sensitivity)
Lamellar ichthyosis (collodion baby)
Lanolin-induced
Large cell acanthoma
Large granular lymphocytic leukemia
Large, red, exophytic nodule on the malar surface of an adult
Laryngeal cancer
Lassa fever
Laugier–Hunziker syndrome
Legius syndrome (neurofibromatosis type 1-like syndrome)
Leiomyosarcoma
Lelis syndrome
Lentigo simplex (simple lentigo)
Lenz–Majewski syndrome
Leptospirosis (Fort Bragg fever, pretibial fever, Weil's disease)
Leschke syndrome
Lethal acantholytic epidermolysis bullosa
Leukonychia (white nails)
Leukotriene receptor antagonist-associated Churg–Strauss syndrome
Lhermitte–Duclos disease
Lichen planopilaris (acuminatus, follicular lichen planus, lichen planus follicularis, peripilaris)
Lichen planus of the nails
Lichen spinulosus (keratosis spinulosa)
Lichenoid actinic keratosis
Lichenoid keratosis (benign lichenoid keratosis, lichen planus-like keratosis, solitary lichen planus, solitary lichenoid keratosis)
Limb–mammary syndrome
Linear and whorled nevoid hypermelanosis (linear nevoid hyperpigmentation, progressive cribriform and zosteriform hyperpigmentation, reticulate and zosteriform hyperpigmentation, reticulate hyperpigmentation of Iijima and Naito and Uyeno, zebra-like hyperpigmentation in whorls and streaks, zebra-line hyperpigmentation)
Linear atrophoderma of Moulin (Moulin atrophoderma linearis)
Linear Darier disease
Linear Darier disease (acantholytic dyskeratotic epidermal nevus)
Linear focal elastosis (elastotic striae)
Linear IgA bullous dermatosis (linear IgA dermatosis)
Linear porokeratosis
Linear scleroderma
Linear verrucous epidermal nevus (linear epidermal nevus, verrucous epidermal nevus)
Lipedematous alopecia (lipedematous scalp)
Lipoatrophia annularis (Ferreira–Marques lipoatrophia)
Lipoatrophia semicircularis (semicircular lipoatrophy)
Lipodermatosclerosis (chronic panniculitis with lipomembranous changes, hypodermitis sclerodermiformis, sclerosing panniculitis, stasis panniculitis)
Lipohypertrophy
Lipoma
Liposarcoma (atypical lipoma, atypical lipomatous tumor)
Lipschütz ulcer (ulcus vulvae acutum)
Lipstick-induced
Listeriosis
Local anesthetic-induced
Localized acquired hypertrichosis
Localized cicatricial pemphigoid (Brunsting–Perry cicatricial pemphigoid)
Localized congenital hypertrichosis
Localized discoid lupus erythematosus
Localized epidermolysis bullosa simplex (Weber–Cockayne syndrome, Weber–Cockayne variant of generalized epidermolysis bullosa simplex)
Localized lichen myxedematosus
Localized lipodystrophy
Localized morphea
Localized morphea
Loeys–Dietz syndrome
Longitudinal erythronychia
Longitudinal melanonychia
Loose anagen syndrome (loose anagen hair syndrome)
Lowry–MacLean syndrome
Ludwig's angina
Lupoid rosacea (granulomatous rosacea, micropapular tuberculid, rosacea-like tuberculid of Lewandowsky)
Lupoid sycosis
Lupus erythematosus
Lupus erythematosus panniculitis (lupus erythematosus profundus, lupus panniculitis, lupus profundus, subcutaneous lupus erythematosus)
Lupus erythematosus–lichen planus overlap syndrome (lichen planus–lupus erythematosus overlap syndrome)
Lupus miliaris disseminatus faciei
Lyme disease (Afzelius' disease, Lyme borreliosis)
Lymphangiectasis (lymphangioma)
Lymphangiomatosis
Lymphogranuloma venereum (climatic bubo, Durand–Nicolas–Favre disease, lymphogranuloma inguinale, poradenitis inguinale, strumous bubo)
Lymphomatoid granulomatosis
Lymphoplasmacytic lymphoma
Macrocheilia
Macrocystic lymphatic malformation
Madarosis
Majeed syndrome
Makassar ebony dermatitis
Malakoplakia (malacoplakia)
Malalignment of the nail plate
Male breast cancer
Male-pattern baldness
Malignant acrospiroma (malignant poroma, porocarcinoma, spiradenocarcinoma)
Malignant blue nevus
Malignant fibrous histiocytoma
Malignant fibrous histiocytoma of bone/osteosarcoma
Malignant mixed tumor (malignant chondroid syringoma)
Malignant peripheral nerve sheath tumor (malignant schwannoma, neurofibrosarcoma, neurosarcoma)
Malignant pilomatricoma (pilomatrical carcinoma, pilomatrix carcinoma)
Malignant trichilemmal cyst
Mandibuloacral dysplasia
Mantle cell lymphoma
Mantleoma
Many hyperkeratotic, vegetative, and hyperpigmented papules in a zosteriform pattern on the right lateral lower extremity of an adult
Many small to large, skin colored nodules on the trunk of an adult
Marfan syndrome
Marginal zone B-cell lymphoma
Marie–Unna hereditary hypotrichosis (Marie–Unna hypotrichosis)
Marine plant-induced
Marinesco–Sjögren syndrome
Marjolin's ulcer
Mast cell leukemia
Mast cell sarcoma
Maternal autoimmune bullous disease
McCune–Albright syndrome
McCusick syndrome
Measles (rubeola, morbilli)
Mechanical irritant dermatitis
Median nail dystrophy (dystrophia unguis mediana canaliformis, median canaliform dystrophy of Heller, solenonychia)
Median raphe cyst
Mediastinal large B cell lymphoma
Mediterranean spotted fever (Boutonneuse fever)
Medium-sized congenital nevocytic nevus
Medullary carcinoma
Medulloblastoma
Mees' lines
Melanoacanthoma
Melanoacanthoma (pigmented seborrheic keratosis)
Melanocytic tumors of uncertain malignant potential
Melanoma
Melanonychia
Melanotic neuroectodermal tumor of infancy
Melioidosis (Whitmore's disease)
Membranous aplasia cutis
Meningocele
Meningococcemia
Menkes kinky hair syndrome (kinky hair disease, Menkes disease)
Mercury dermatitis
Merkel cell carcinoma
Merkel cell carcinoma (cutaneous apudoma, primary neuroendocrine carcinoma of the skin, primary small cell carcinoma of the skin, trabecular carcinoma of the skin)
Mesothelioma
Metageria
Metastatic carcinoma
Methotrexate-induced papular eruption
Metophyma
Microcystic adnexal carcinoma (sclerosing sweat duct carcinoma)
Microcystic lymphatic malformation
Micronodular basal cell carcinoma
Microphthalmia–dermal aplasia–sclerocornea syndrome
Microvenular hemangioma (microcapillary hemangioma)
Midline cervical cleft
Midline nevus flammeus (angel's kiss, salmon patch)
Milia en plaque
Milium
Milium
Milker's nodule
Missouri Lyme disease
Mitis junctional epidermolysis bullosa (nonlethal junctional epidermolysis bullosa)
Mitochondrial myopathy–encephalopathy–lactic acidosis–stroke syndrome
Mixed connective tissue disease (Sharp's syndrome, undifferentiated connective tissue disease)
Mixed tumor (chondroid syringoma)
Modified varicella-like syndrome
Molluscum contagiosum
Molluscum dermatitis
Mongolian spot
Mongolian spot (congenital dermal melanocytosis, dermal melanocytosis)
Monilethrix (beaded hair)
Morphea profunda
Morphea–lichen sclerosus et atrophicus overlap
Mouth and genital ulcers with inflamed cartilage syndrome (MAGIC syndrome)
Mouthwash-induced
Moynahan syndrome
Mucinous carcinoma
Mucinous nevus (nevus mucinosus)
Muckle–Wells syndrome
Mucosa-associated lymphoid tissue lymphoma
Mucosal lentigines (labial and penile and vulvar melanosis, melanotic macules)
Muehrcke's nails (Muehrcke's lines)
Muir–Torre syndrome
Mulberry molar
Multifocal lymphangioendotheliomatosis (congenital cutaneovisceral angiomatosis with thrombocytopenia, multifocal lymphangioendotheliomatosis with thrombocytopenia)
Multinucleate cell angiohistocytoma
Multiple cutaneous and uterine leiomyomatosis syndrome (leiomyomatosis cutis et uteri, multiple leiomyomatosis, Reed's syndrome)
Multiple cutaneous leiomyoma (pilar leiomyoma)
Multiple dark red skin lesions
Multiple endocrine neoplasia syndrome
Multiple familial trichoepithelioma (Brooke–Spiegler syndrome, epithelioma adenoides cysticum)
Multiple keratoacanthomas (Ferguson–Smith syndrome, Ferguson-Smith type of multiple self-healing keratoacanthomas, multiple keratoacanthomas of the Ferguson–Smith type)
Multiple lentigines syndrome (cardiocutaneous syndrome, Gorlin syndrome II, lentiginosis profusa syndrome, LEOPARD syndrome, progressive cardiomyopathic lentiginosis)
Multiple minute digitate hyperkeratosis (digitate keratoses, disseminated spiked hyperkeratosis, familial disseminated piliform hyperkeratosis, minute aggregate keratosis)
Multiple myeloma/plasma cell neoplasm
Multiple pterygium syndrome
Multiple red papules scattered over a child's head, neck, trunk, and upper extremities
Multiple reddish-brown papules coalescing over the right arm of a boy
Multiple small subcorneal pustules on erythematous patches
Multiple sulfatase deficiency (Austin disease, mucosulfatidosis)
Multiple tan patches scattered over the back of a young child
Multiple, dystrophic, irregular, shortened fingernails
Multiple, small, blue to red papules on the scrotum
Mycoplasma infection
Mycosis fungoides
Myelodysplastic syndromes
Myrmecia
Myxoid cyst (digital mucous cyst, mucous cyst)
Myxoid lipoblastoma
Naegeli–Franceschetti–Jadassohn syndrome (chromatophore nevus of Naegeli)
Nager acrofacial dysostosis
Nail lacquer-induced
Nail polish remover-induced
Nail–patella syndrome
Nail–patella syndrome (Fong syndrome, hereditary osteoonychodysplasia, HOOD syndrome)
Nasal glioma (brain-like heterotopia, cephalic brain-like heterotopia, glial hamartoma, heterotopic neuroglial tissue, nasal cerebral heterotopia, nasal heterotopic brain tissue)
Nasolacrimal duct cyst
Nasopharyngeal carcinoma
Necrolytic acral erythema
Necrolytic migratory erythema
Necrotizing fasciitis (flesh-eating bacteria syndrome)
Neonatal acne (acne infantum, acne neonatorum, neonatal cephalic pustulosis)
Neonatal herpes simplex
Neonatal ichthyosis–sclerosing cholangitis syndrome (ichthyosis–sclerosing cholangitis syndrome, NISCH syndrome)
Neonatal lupus erythematosus
Neonatal toxic shock-like exanthematous disease
Neoplasms of the nailbed
Nephrogenic systemic fibrosis (nephrogenic fibrosing dermopathy)
Netherton syndrome
Neural fibrolipoma
Neuroblastoma
Neuroblastoma (infantile neuroblastoma, neuroepithelioma)
Neurofibromatosis type 1
Neurofibromatosis type 1 (von Recklinghausen's disease)
Neurofibromatosis type 3 (neurofibromatosis mixed type)
Neurofibromatosis type 4 (neurofibromatosis variant type)
Neuroma cutis
Neuropathia mucinosa cutanea
Neurothekeoma (bizarre cutaneous neurofibroma, cutaneous lobular neuromyxoma, myxoma of the nerve sheath, myxomatous perineurioma, nerve sheath myxoma)
Neutral lipid storage disease (Dorfman–Chanarin syndrome)
Neutrophilic lobular panniculitis
Nevoid basal cell carcinoma syndrome (basal cell nevus syndrome, Gorlin syndrome, Gorlin–Goltz syndrome)
Nevoid hypertrichosis
Nevus comedonicus (comedo nevus)
Nevus comedonicus syndrome
Nevus flammeus (capillary malformation, port-wine stain)
Nevus flammeus nuchae (stork bite)
Nevus lipomatosus superficialis (nevus lipomatosis of Hoffman and Zurhelle)
Nevus of Ito (nevus fuscoceruleus acromiodeltoideus)
Nevus of Ota (congenital melanosis bulbi, melanosis bulborum and aberrant dermal melanocytosis, nevus fuscoceruleus ophthalmomaxillaris, oculodermal melanocytosis, oculomucodermal melanocytosis)
Nevus oligemicus
Nevus psiloliparus
Nevus sebaceous (nevus sebaceous of Jadassohn, organoid nevus)
Nevus spilus (speckled lentiginous nevus, zosteriform lentiginous nevus)
Nevus unius lateris
Nickel dermatitis
Nicolau–Balus syndrome
Nocardiosis
Nodal marginal zone B cell lymphoma
Nodular basal cell carcinoma (classic basal cell carcinoma)
Nodular fasciitis (nodular pseudosarcomatous fasciits, pseudosarcomatous fasciitis, subcutaneous pseudosarcomatous fibromatosis)
Nodular lichen myxedematosus
Nodular vasculitis
Nodules–eosinophilia–rheumatism–dermatitis–swelling syndrome
Nodulosis–arthropathy–osteolysis syndrome
Noma neonatorum
Non-Hodgkin lymphoma
Non-involuting congenital hemangioma
Non-progressive late-onset linear hemifacial lipoatrophy
Non-small cell lung cancer
Nonbullous congenital ichthyosiform erythroderma (congenital ichthyosiform erythroderma)
Noncicatricial alopecia
Noonan syndrome
Normophosphatemic familial tumoral calcinosis
North Asian tick typhus
Nummular dermatitis (discoid eczema, microbial eczema, nummular eczema, nummular neurodermatitis)
Nutritional deficiency eczema
Occipital horn syndrome
Occupation-induced
Occupational acne
Ocular rosacea (ophthalmic rosacea, ophthalmorosacea)
Oculocerebrocutaneous syndrome (Delleman–Oorthuys syndrome)
Oculodentodigital dysplasia
Odonto–Tricho–Ungual–Digital–Palmar syndrome
Oil acne
Oligodendroglioma
Oliver–McFarlane syndrome
Omphalomesenteric duct cyst (omphalomesenteric duct remnant, vitelline cyst)
Onychauxis
Onychoatrophy
Onychocryptosis (ingrown nail, unguis incarnatus)
Onychogryphosis (ram's horn nails)
Onycholysis
Onychomadesis
Onychomatricoma
Onychophagia (nail biting)
Onychophosis
Onychoptosis defluvium (alopecia unguium)
Onychorrhexis (brittle nails)
Onychoschizia
Onychotillomania
Onychotillomania
Ophiasis
Ophthalmia neonatorum
Ophthalmic zoster
Oral cancer
Oral submucous fibrosis
Orf (contagious pustular dermatosis, ecthyma contagiosum, infectious labial dermatitis, sheep pox)
Orf-induced immunobullous disease
Orofaciodigital syndrome
Orolabial herpes (herpes labialis)
Oropharyngeal cancer
Oroya fever (Carrion's disease)
Osteogenesis imperfecta (Lobstein syndrome)
Osteosarcoma
Otophyma
Ovarian cancer
Ovarian epithelial cancer (surface epithelial-stromal tumor)
Ovarian germ cell tumor
p-Chloro-meta-xylenol-induced
Pachydermatous eosinophilic dermatitis
Pachydermodactyly
Pachydermoperiostosis (idiopathic hypertrophic osteoathorpathy, Touraine–Solente–Gole syndrome)
Paget's disease of the breast
Palisaded encapsulated neuroma
Palisaded neutrophilic and granulomatous dermatitis
Palmoplantar hyperhidrosis (emotional hyperhidrosis)
Pancreatic cancer, islet cell
Pancreatic panniculitis (enzymatic panniculitis, pancreatic fat necrosis, subcutaneous fat necrosis)
Pansclerotic morphea
Papillary eccrine adenoma (tubular apocrine adenoma)
Papillary hidradenoma (hidradenoma papilliferum)
Papillomatosis cutis carcinoides (Gottron's carcinoid papillomatosis, papillomatosis cutis carcinoides of Gottron–Eisenlohr)
Papular eruption of blacks
Papular mucinosis (generalized lichen myxedematosus, sclerodermoid lichen myxedematosus, scleromyxedema)
Papular mucinosis of infancy (cutaneous mucinosis of infancy)
Papular purpuric gloves and socks syndrome
Papuloerythroderma of Ofuji
Papulopustular rosacea (inflammatory rosacea)
Paraben-induced
Parakeratosis pustulosa
Paranasal sinus and nasal cavity cancer
Paraneoplastic pemphigus
Paraneoplastic syndrome
Paraphenylenediamine dermatitis
Parathyroid cancer
Parry–Romberg syndrome (progressive hemifacial atrophy)
Partial unilateral lentiginosis (segmental lentiginosis)
Pasteurellosis
Patch blue nevus (acquired dermal melanocytosis, dermal melanocyte hamartoma)
Patterned acquired hypertrichosis
Pearly penile papules (hirsuties coronae glandis, hirsutoid papillomas)
Peeling skin syndrome (acral peeling skin syndrome, continual peeling skin syndrome, familial continual skin peeling, idiopathic deciduous skin, keratolysis exfoliativa congenita)
PELVIS syndrome
Pemphigoid nodularis
Pemphigus erythematosus (Senear–Usher syndrome)
Pemphigus foliaceus
Pemphigus herpetiformis (acantholytic herpetiform dermatitis, herpetiform pemphigus, mixed bullous disease, pemphigus controlled by sulfapyridine)
Pemphigus vegetans
Pemphigus vegetans of Hallopeau
Pemphigus vegetans of Neumann
Pemphigus vulgaris
Penile cancer
Perforating calcific elastosis (localized acquired cutaneous pseudoxanthoma elasticum, perforating periumbilical calcific elastosis, periumbilical perforating pseudoxanthoma elasticum)
Perforating folliculitis
Perianal cellulitis (perineal dermatitis, streptococcal perianal disease)
Periapical abscess
Perifollicular fibroma
Perifollicular mucinosis
Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp, dissecting folliculitis, perifolliculitis capitis abscedens et suffodiens of Hoffman)
Perioral dermatitis
Periorbital dermatitis (periocular dermatitis)
Periorificial dermatitis
Permanent wave preparation-induced
Persistent edema of rosacea (chronic upper facial erythematous edema, Morbihan's disease, rosaceous lymphedema)
Peutz–Jeghers syndrome
Peyronie's disease (induratio penis plastica)
Pfeiffer syndrome
Phakomatosis pigmentokeratotica
Phakomatosis pigmentovascularis
Pharyngeal cancer
Phenothiazine drug-induced
Pheochromocytoma
Photoallergic
Photoirritant
Photosensitive drug reaction
Photosensitivity–ichthyosis–brittle sulfur-deficient hair–impaired intelligence–decreased fertility–short stature syndrome
Phyllodes tumor
Phymatous rosacea
Pigmented actinic keratosis
Pigmented basal cell carcinoma
Pigmented hairy epidermal nevus syndrome
Pigmented spindle cell nevus (pigmented spindle cell tumor of Reed, pigmented variant of Spitz nevus)
Pigmented wart
Pilar sheath acanthoma
Pili annulati (ringed hair)
Pili bifurcati
Pili multigemini
Pili pseudoannulati (pseudo pili annulati)
Pili torti (twisted hairs)
Pilocytic astrocytoma
Piloleiomyoma
Pilomatricoma (calcifying epithelioma of Malherbe, Malherbe calcifying epithelioma, pilomatrixoma)
Pilonidal sinus (Barber's interdigital pilonidal sinus, pilonidal cyst, pilonidal disease)
Pincer nails (omega nails, trumpet nails)
Pineal astrocytoma
Pinta
Pitted keratolysis (keratolysis plantare sulcatum, keratoma plantare sulcatum, ringed keratolysis)
Pituitary adenoma
Pityriasis amiantacea (tinea amiantacea)
Pityriasis rotunda (pityriasis circinata, tinea circinata)
Plague
Plant derivative-induced
Plantar fibromatosis (Ledderhose's disease)
Plaque-type porokeratosis (classic porokeratosis, porokeratosis of Mibelli)
Plasmablastic lymphoma
Plate-like osteoma cutis
Platonychia
Pleomorphic fibroma
Pleomorphic lipoma
Pleuropulmonary blastoma
Plexiform fibrohistiocytic tumor
Plica neuropathica (felted hair)
Plummer's nail
Poland anomaly
Poland's syndrome
Pollen-induced
Polyester resin dermatitis
Polyneuropathy–organomegaly–endocrinopathy–monoclonal gammopathy–skin changes syndrome (Crow–Fukase syndrome)
Polyostotic fibrous dysplasia (Albright's disease)
Polypoid basal cell carcinoma
Pomade acne
Popliteal pterygium syndrome
Pore-like basal cell carcinoma
Porokeratosis
Porokeratosis palmaris et plantaris disseminata
Porokeratotic eccrine ostial and dermal duct nevus
Post-steroid panniculitis
Post-vaccination follicular eruption
Posterior fossa malformations–hemangiomas–arterial anomalies–cardiac defects–eye abnormalities–sternal cleft and supraumbilical raphe syndrome (PHACE association, PHACES syndrome)
Postherpetic neuralgia (zoster-associated pain)
Prader–Willi syndrome
Preauricular sinus and cyst (ear pit, congenital auricular fistula, congenital preauricular fistula, preauricular cyst)
Precursor B lymphoblastic leukemia
Premature greying of hair
Prepubertal hypertrichosis
Pressure alopecia (postoperative alopecia, pressure-induced alopecia)
Primary central nervous system lymphoma
Primary cutaneous adenoid cystic carcinoma
Primary cutaneous follicular lymphoma
Primary cutaneous immunocytoma
Primary effusion lymphoma
Primary gonococcal dermatitis
Primitive neuroectodermal tumor
Progeria (Hutchinson–Gilford progeria syndrome, Hutchinson–Gilford syndrome, progeria syndrome)
Progressive nodular histiocytoma
Progressive osseous heteroplasia
Progressive symmetric erythrokeratodermia (erythrokeratodermia progressiva symmetrica)
Progressive systemic sclerosis
Progressive vaccinia (vaccinia gangrenosum, vaccinia necrosum)
Proliferating angioendotheliomatosis
Proliferating epidermoid cyst (proliferating epithelial cyst)
Proliferating trichilemmal cyst (pilar tumor, proliferating follicular cystic neoplasm, proliferating pilar tumor, proliferating trichilemmal tumor)
Prominent inferior labial artery
Propylene glycol-induced
Prostate cancer
Protein contact dermatitis
Proteus syndrome
Proteus-like syndrome
Pruritic papular eruption of HIV disease
Pseudo-ainhum
Pseudocowpox
Pseudocyst of the auricle (auricular endochondrial pseudocyst, cystic chondromalacia, endochondral pseudocyst, intracartilaginous cyst)
Pseudoepitheliomatous keratotic and micaceous balanitis
Pseudofolliculitis barbae (barber's itch, folliculitis barbae traumatica, razor bumps, scarring pseudofolliculitis of the beard, shave bumps)
Pseudomelanoma (recurrent melanocytic nevus, recurrent nevus)
Pseudomonal pyoderma
Pseudomonas hot-foot syndrome
Pseudopelade of Brocq (alopecia cicatrisata)
Pseudoxanthoma elasticum (Grönblad–Strandberg syndrome)
Psoriatic nails
Pterygium inversum unguis (pterygium inversus unguis, ventral pterygium)
Pterygium unguis (dorsal pterygium)
Punctate porokeratosis
Purpura of the nail bed
PUVA keratosis
PUVA lentigines
Pyoderma faciale (rosacea fulminans)
Pyogenic paronychia
Pyomyositis
Q fever
Quaternium-15 hypersensitivity
Queensland tick typhus
Racquet nail (brachyonychia, nail en raquette, racquet thumb)
Rapidly involuting congenital hemangioma (congenital nonprogressive hemangioma)
Rapp–Hodgkin syndrome (Rapp–Hodgkin ectodermal dysplasia syndrome)
Rasmussen syndrome
Rat-bite fever
Reactional keratosis
Reactive perforating collagenosis
Recessive dystrophic epidermolysis bullosa (Hallopeau–Siemens variant of epidermolysis bullosa, Hallopeau–Siemens disease)
Rectal cancer
Recurrent palmoplantar hidradenitis (idiopathic palmoplantar hidradenitis, idiopathic plantar hidradenitis, painful plantar erythema, palmoplantar eccrine hidradenitis, plantar panniculitis)
Recurrent respiratory papillomatosis (laryngeal papillomatosis)
Recurrent toxin-mediated perineal erythema
Red erosions, some with crusting, all on the back of an adult hand
Red lunulae
Red man syndrome
Redness and mild swelling of an adult leg
Redness and swelling of an ear
Reed dermatitis
Refsum's disease (heredopathia atactica polyneuritiformis, phytanic acid storage disease)
Relapsing linear acantholytic dermatosis
Relapsing polychondritis (atrophic polychondritis, systemic chondromalacia)
Renal cell carcinoma
Renal pelvis and ureter, transitional cell cancer
Restrictive dermopathy
Reticular erythematous mucinosis (midline mucinosis, plaque-like cutaneous mucinosis, REM syndrome)
Reticulated seborrheic keratosis (adenoid seborrheic keratosis)
Retiform hemangioendothelioma (hobnail hemangioendothelioma)
Retinoblastoma
Rhabdomyosarcoma
Rheumatoid arthritis
Rheumatoid nodulosis (accelerated rheumatoid nodulosis)
Rheumatoid vasculitis
Rhinophyma
Rhinophyma
Rhinoscleroma
Rhizomelic chondrodysplasia punctata (autosomal recessive chondrodysplasia punctata type 1, chondrodystrophia calcificans punctata, peroxisomal biogenesis disorder complementation group 11)
Rickettsia aeschlimannii infection
Rickettsialpox
Rift Valley fever
Rocky Mountain spotted fever
Rodent ulcer (Jacobi ulcer)
Rombo syndrome
Rosacea (acne rosacea)
Rosacea conglobata
Rosenthal–Kloepfer syndrome
Roseola infantum (exanthem subitum, exanthema subitum, sixth disease)
Roseola vaccinia
Rosewood dermatitis
Rosin dermatitis
Ross' syndrome
Rothmund–Thomson syndrome (poikiloderma congenitale)
Rowell's syndrome
Rubber dermatitis
Rubella (German measles)
Rubinstein–Taybi syndrome
Rud syndrome
Rudimentary supernumerary digit (rudimentary polydactyly)
rythema annulare centrifugum (deep gyrate erythema, erythema perstans, palpable migrating erythema, superficial gyrate erythema)
Saber shin (anterior tibial bowing)
SACRAL syndrome
Saddle nose
Salivary gland cancer
Salmonellosis
Sandfly fever (Pappataci fever, phlebotomus fever)
Say syndrome
Scalp–ear–nipple syndrome (Finlay–Marks syndrome)
Scarlet fever
Schimmelpenning syndrome (Schimmelpenning–Feuerstein–Mims syndrome)
Schindler disease (Kanzaki disease, alpha-N-acetylgalactosaminidase deficiency)
Schinzel–Giedion syndrome
Schwannoma (acoustic neuroma, neurilemmoma, neurinoma, neurolemmoma, Schwann cell tumor)
Schweninger–Buzzi anetoderma
Scleredema adultorum (Bushke disease, scleredema diabeticorum, scleredema adultorum of Buschke, scleredema of Buschke)
Sclerema neonatorum
Scleroatrophic syndrome of Huriez (Huriez syndrome, palmoplantar keratoderma with scleroatrophy, palmoplantar keratoderma with sclerodactyly, scleroatrophic and keratotic dermatosis of the limbs, sclerotylosis)
Scleroderma
Scleroderma-like reaction to taxanes
Sclerosing lipogranuloma (paraffinoma)
Sclerotic fibroma
Scrub typhus (Tsutsugamushi fever)
Sealpox
Sebaceoma (sebaceous epithelioma)
Sebaceous adenoma
Sebaceous carcinoma
Sebaceous hyperplasia
Sebaceous nevus syndrome
Seboacanthoma
Seborrheic keratosis (seborrheic verruca, senile wart)
Seborrheic keratosis with squamous atypia
Seed-induced
Segmental neurofibromatosis
Self-healing juvenile cutaneous mucinosis
Self-healing papular mucinosis
Senter syndrome (Desmons' syndrome)
Septal panniculitis
Serum sickness-like reaction
Setleis syndrome
Several light blue patches of skin distributed over a child's lower back and buttock
Severe cutaneous adverse reactions (includes DRESS syndrome, Steven Johnson syndrome, Toxic epidermal necrolysis, Stevens-Johnson/toxic epidermal necrolysis overlap syndrome, and Acute generalized exanthematous pustulosis)
Sézary syndrome
Shabbir syndrome (laryngo–onycho–cutaneous syndrome)
Shell nail syndrome
Shigellosis
Shoe dermatitis
Short anagen syndrome
Signet-ring cell squamous cell carcinoma
Silicosis
Silver–Russell syndrome
Sinus pericranii
Sjögren–Larsson syndrome
Sjögren's syndrome (Mikulicz disease, Sicca syndrome)
Skin cancer (non-melanoma)
Skin dimple (skin fossa)
Skin fragility syndrome (plakophilin 1 deficiency)
Small cell lung cancer
Small-sized congenital nevocytic nevus
Small, linear, blue-black areas of discoloration beneath the nail plate of an adult finger
Small, raised, skin-colored lesions
Small, red, monomorphic skin lesions on the back of an adult arm
Smith–Lemli–Opitz syndrome
Solar lentigo
Solitary angiokeratoma
Solitary cutaneous leiomyoma
Solitary keratoacanthoma (subungual keratoacanthoma)
Solitary mastocytoma
Solitary neurofibroma (plexiform neurofibroma, solitary nerve sheath tumor, sporadic neurofibroma)
Solitary trichoepithelioma
Solitary, large, white to yellow erosion on the inner lower lip of a child
Solitary, pink, dome-shaped papule on the superior helix of an adult
Solitary, pink, pearly appearing skin lesion on the side of an adult nose
Solvent-induced
Sorbic acid-induced
Spider angioma (nevus araneus, spider telangiectasia, spider nevus, vascular spider)
Spindle cell hemangioendothelioma (spindle cell hemangioma)
Spindle cell lipoma
Spindle cell squamous cell carcinoma (spindle cell carcinoma)
Spiradenoma
Spitz nevus (benign juvenile melanoma, epithelioid and spindle cell nevus, Spitz's juvenile melanoma)
Splenic marginal zone lymphoma
Splinter hemorrhage
Splinter hemorrhage
Spotted lunulae
Squamous cell carcinoma
Squamous cell carcinoma
Staining of the nail plate
Staphylococcal scalded skin syndrome (pemphigus neonatorum, Ritter's disease)
Steatocystoma multiplex (epidermal polycystic disease, sebocystomatosis)
Steatocystoma simplex (simple sebaceous duct cyst, solitary steatocystoma)
Sternal cleft
Steroid acne
Steroid folliculitis
Steroid rosacea
Stevens–Johnson syndrome
Stiff skin syndrome
Stippled nails
Streptococcal intertrigo
Striae atrophicans
Striae distensae
Stucco keratosis (digitate seborrheic keratosis, hyperkeratotic seborrheic keratosis, keratosis alba, serrated seborrheic keratosis, verrucous seborrheic keratosis)
Sturge–Weber syndrome
Subacute cutaneous lupus erythematosus
Subcutaneous fat necrosis of the newborn
Subjective irritant contact dermatitis (sensory irritant contact dermatitis)
Subungual exostosis
Subungual hematoma
Sulfonamide hypersensitivity syndrome
Sulzberger–Garbe syndrome (oid-oid disease)
Sunscreen-induced
Superficial acral fibromyxoma
Superficial basal cell carcinoma (superficial multicentric basal cell carcinoma)
Superficial lymphatic malformation (lymphangioma circumscriptum)
Superficial pustular folliculitis (impetigo of Bockhart, superficial folliculitis)
Supernumerary nipple (accessory nipple, pseudomamma)
Supernumerary nipples–uropathies–Becker's nevus syndrome
Sycosis vulgaris (barber's itch, sycosis barbae)
Synovitis–acne–pustulosis–hyperostosis–osteomyelitis syndrome (SAPHO syndrome)[nb 6]
Syphilid
Syphilis (lues)
Syringadenoma papilliferum (syringocystadenoma papilliferum)
Syringofibroadenoma (acrosyringeal nevus of Weedon and Lewis)
Syringoma
Systematized epidermal nevus
Systemic contact dermatitis
Systemic lupus erythematosus
Systemic mastocytosis
T-cell prolymphocytic leukemia
Tar acne
Targetoid hemosiderotic hemangioma (hobnail hemangioma)
Tear gas dermatitis
Telangiectasia
Telangiectasia macularis eruptiva perstans
Telogen effluvium
Teratoma
Terminal osseous dysplasia with pigmentary defects
Terry's nails
Testicular cancer
Texier's disease
Textile dermatitis
The lower back of an adult with thickened, indurated patches of skin
Thermal keratosis
Thick, fish-like scales on an adult lower leg
Thymoma and thymic carcinoma
Thyroglossal duct cyst
Thyroid cancer
Tick-borne lymphadenopathy
TNF receptor associated periodic syndrome
Tooth and nail syndrome (hypodontia with nail dysgenesis, Witkop syndrome)
Townes–Brocks syndrome
Toxic epidermal necrolysis (Lyell's syndrome)
Toxic oil syndrome
Toxic shock syndrome (streptococcal toxic shock syndrome, streptococcal toxic shock-like syndrome, toxic streptococcal syndrome)
Toxicodendron dermatitis
Traction alopecia
Transient bullous dermolysis of the newborn
Traumatic alopecia
Traumatic anserine folliculosis
Traumatic irritant contact dermatitis
Traumatic panniculitis
Treacher Collins syndrome (Treacher Collins–Franceschetti syndrome)
Tree-associated plant-induced
Tree-induced
Trench fever (five-day fever, quintan fever, urban trench fever)
Triangular alopecia (temporal alopecia, temporal triangular alopecia)
Trichilemmal carcinoma
Trichilemmal cyst (isthmus-catagen cyst, pilar cyst)
Trichilemmoma
Tricho–dento–osseous syndrome
Tricho–rhino–phalangeal syndrome
Trichoadenoma (trichoadenoma of Nikolowski)
Trichoblastic fibroma
Trichoblastoma
Trichodiscoma
Trichofolliculoma
Trichomegaly
Trichomycosis axillaris
Trichorrhexis invaginata (bamboo hair)
Trichorrhexis nodosa
Trichostasis spinulosa
Tropical acne
Tropical ulcer (Aden ulcer, jungle rot, Malabar ulcer, tropical phagedena)
Tuberous sclerosis (Bourneville disease, epiloia)
Tubular carcinoma
Tufted angioma (acquired tufted angioma, angioblastoma, angioblastoma of Nakagawa, hypertrophic hemangioma, progressive capillary hemangioma, tufted hemangioma)
Tufted folliculitis
Tularemia (deer fly fever, Ohara's disease, Pahvant Valley plague, rabbit fever)
Tulip fingers
Tumid lupus erythematosus (lupus erythematosus tumidus)
Tumor alopecia
Tumor lysis syndrome
Turner syndrome
Tuzun syndrome
Twenty-nail dystrophy (sandpapered nails, trachyonychia)
Two coalescing, red, scaly patches on the dorsal surface of an adult finger
Ulceration and crusting over a skin lesion on the front of an adult nose
Ullrich disease
Ulnar–mammary syndrome
Umbilical granuloma
Uncombable hair syndrome (cheveux incoiffable, pili trianguli et canaliculi, spun-glass hair)
Unilateral palmoplantar verrucous nevus
Universal angiomatosis (generalized telangiectasia)
Ureter and renal pelvis, transitional cell cancer
Urethral cancer
Urethral caruncle
Urshiol-induced
Urticaria pigmentosa
Urticaria pigmentosa (childhood type of generalized eruption of cutaneous mastocytosis)
Urticarial erythema multiforme
Uterine sarcoma
Uveal melanoma
Vaginal cancer
Van Der Woude syndrome
Varicella
Varicella (chickenpox)
Variola major (smallpox)
Vegetable-induced
Venous lake
Venous lake (phlebectasis)
Verruca plana (flat wart)
Verruca plantaris (plantar wart)
Verruca vulgaris (wart)
Verrucae palmares et plantares
Verrucous carcinoma
Verrucous cyst (cystic papilloma)
Verrucous lupus erythematosus (hypertrophic lupus erythematosus)
Verrucous perforating collagenoma
Verrucous vascular malformation
Verruga peruana
Vesicular pemphigoid
Vibrio vulnificus infection
Viral keratosis
Viral-associated trichodysplasia (ciclosporin-induced folliculodystrophy)
Visual pathway and hypothalamic glioma
Vitamin K reaction
Von Hippel–Lindau syndrome
Vulvar cancer
Vulvar childhood pemphigoid
Warfarin necrosis
Warty dyskeratoma (isolated dyskeratosis follicularis)
Wasting syndrome
Watson syndrome
Waxy keratosis of childhood (kerinokeratosis papulosa)
Weber–Christian disease
Werner syndrome (adult progeria)
West Nile virus infection
Westerhof syndrome
Whistling syndrome (craniocarpotarsal syndrome, distal arthrogryposis type 2, Freeman–Sheldon syndrome, Windmill–Vane–Hand syndrome)
Wildervanck syndrome
Wilms tumor
Wilson–Turner syndrome
Winchester syndrome
Wolf–Hirschhorn syndrome (4p- syndrome)
Wooly hair nevus (woolly hair nevus)
Wrinkly skin syndrome
X-linked hypertrichosis
X-linked ichthyosis
X-linked ichthyosis (steroid sulfatase deficiency, X-linked recessive ichthyosis)
X-linked recessive chondrodysplasia punctata
Xanthelasmoidal mastocytosis
Xeroderma pigmentosum
Xeroderma pigmentosum (Cockayne syndrome complex)
Xerotic eczema
XXYY genotype
Yaws
Zimmermann–Laband syndrome
Zoon's vulvitis
Zoster (herpes zoster, shingles)
Zoster sine herpete
Zosteriform metastasis
Zosteriform speckled lentiginous nevus