Index by Histological Category
- Acantholytic disorders
- Darier disease
- Grover disease
- Hailey-Hailey disease
- Herpes virus infection
- Pemphigus foliaceus
- Pemphigus vegetans
- Pemphigus vulgaris
- Squamous cell carcinoma, acantholytic
- Warty dyskeratoma
- Connective tissue disorders
- Discoid lupus erythematosus
- Lichen sclerosus
- Lupus profundus
- Lupus tumidus
- Morphea
- Polyarteritis nodosa
- Rheumatoid nodule
- Scleredema
- Scleromyxedema
- Endogenous material
- Amyloidosis
- Calcinosis cutis
- Cryoglobulinemia
- Digital mucous cyst
- Erythropoietic protoporphyria
- Focal cutaneous mucinosis
- Follicular mucinosis
- Gout
- Hemosiderin
- Lipoid proteinosis
- Melanin
- Mucocele
- Osteoma cutis
- Pretibial myxedema
- Pseudoxanthoma elasticum
- Foreign material
- Aluminum chloride (Drysol solution)
- Argyria
- Ferric subsulfate (Monsel solution)
- Gel foam
- Hyaluronic acid (dermal filler)
- Ochronosis
- Paraffinoma
- Tattoo
- Genodermatoses
- Epidermolytic hyperkeratosis
- Erythropoietic protoporphyria
- Ichthyosis vulgaris
- Incontinentia pigmenti
- Lipoid proteinosis
- Granulomatous
- Granuloma annulare
- Necrobiosis lipoidica
- Necrobiotic xanthogranuloma
- Rheumatoid nodule
- Ruptured cyst/keratin granuloma
- Sarcoidosis
- Suture granuloma
- Histiocytic
- Juvenile xanthogranuloma
- Langerhans cell histiocytosis
- Reticulohistiocytosis
- Rosai-Dorfman disease
- Xanthelasma
- Xanthogranuloma
- Xanthoma
- Infections
- Aspergillosis
- Bacillary angiomatosis
- Blastomycosis
- Chromomycosis
- Coccidioidomycosis
- Cryptococcosis, gelatinous
- Dermatophytosis
- Epidermodysplasia verruciformis
- Herpes virus infection
- Histoplasmosis
- Kaposi sarcoma
- Leishmaniasis
- Lepromatous leprosy
- Molluscum contagiosum
- Myrmecium
- Orf
- Scabies
- Secondary syphilis
- Tinea versicolor
- Verruca plana
- Verruca vulgaris
- Blistering disorders
- Bullous pemphigoid
- Dermatitis herpetiformis
- Herpes gestationis
- Porphyria cutanea tarda
- Interface reactions
- Discoid lupus erythematosus
- Erythema multiforme
- Fixed drug reaction
- Graft-versus-host disease
- Lichen nitidus
- Lichen planus
- Lichen striatus
- Pigmented purpuric dermatosis
- Pityriasis lichenoides et varioliformis acuta
- Porokeratosis
- Miscellaneous
- Acne keloidalis
- Axillary granular parakeratosis
- Burn
- Chondrodermatitis nodularis helicis
- Elastosis perforans serpiginosa
- Erythema elevatum diutinum
- Flegel disease
- Granuloma faciale
- Gyrate erythema
- Mastocytosis
- Nutritional deficiency
- Perniosis
- Pigmented purpuric dermatosis
- Polymorphous light eruption
- Porokeratosis
- Radiation dermatitis
- Reactive perforating collagenosis
- Scabies
- Sweet syndrome
- Urticaria
- Zoon balanitis
- Panniculitis and other disorders of adipose tissue
- Erythema induratum
- Erythema nodosum
- Lipodermatosclerosis
- Lupus profundus
- Pancreatic fat necrosis
- Polyarteritis nodosa
- Subcutaneous fat necrosis of newborn
- Subcutaneous T-cell lymphoma
- Papulosquamous disorders
- Chronic spongiotic dermatitis
- Inflammatory linear verrucous epidermal nevus
- Lichen simplex chronicus
- Pityriasis rubra pilaris
- Psoriasis
- Spongiotic disorders
- Allergic contact dermatitis
- Arthropod bite reaction
- Chronic spongiotic dermatitis
- Eosinophilic spongiosis
- Pityriasis rosea
- Spongiotic dermatitis
- Stasis dermatitis
- Vasculitis
- Erythema induratum
- Granuloma faciale
- Leukocytoclastic vasculitis
- Polyarteritis nodosa
- Malformations
- Accessory digit
- Accessory nipple
- Accessory tragus
- Branchial cleft cyst
- Bronchogenic cyst (not pictured)
- Dermoid cyst
- Benign tumors
- Adipose tumors
- Angiolipoma
- Hibernoma
- Lipoma
- Adnexal tumors
- Follicular
- Desmoplastic trichoepithelioma
- Fibroepithelioma of Pinkus
- Fibrofolliculoma
- Pilar sheath acanthoma
- Pilomatricoma
- Trichilemmoma
- Trichoadenoma
- Trichoblastoma
- Trichoepithelioma
- Trichofolliculoma
- Tumor of the follicular infundibulum
- Glandular (apocrine and eccrine)
- Apocrine hidrocystoma
- Chondroid syringoma
- Cylindroma
- Hidradenoma papilliferum
- Nodular hidradenoma
- Papillary eccrine adenoma
- Poroma
- Spiradenoma
- Syringocystadenoma papilliferum
- Syringofibroadenoma
- Syringoma
- Tubular apocrine adenoma
- Sebaceous
- Nevus sebaceus of Jadassohn
- Sebaceoma (sebaceous epithelioma)
- Sebaceous adenoma
- Fibrous tumors
- Dermatofibroma
- Dermatofibroma, hemosiderotic
- Dermatofibrosarcoma protuberans
- Digital fibrokeratoma
- Fibrous papule
- Giant cell tumor of tendon sheath
- Infantile digital fibromatosis
- Nodular fasciitis
- Scar
- Sclerotic fibroma
- Melanocytic tumors
- Blue nevus
- Blue nevus, cellular
- Blue nevus, hypopigmented
- Deep penetrating nevus
- Halo nevus
- Intradermal nevus
- Mongolian spot
- Pigmented spindle cell nevus of Reed
- Recurrent nevus
- Spitz nevus
- Miscellaneous tumors/lesions
- Auricular pseudocyst
- Bronchogenic cyst (not pictured)
- Clear cell acanthoma
- Cutaneous ciliated cyst
- Cutaneous endometriosis
- Dilated pore of Winer
- Epidermoid inclusion cyst
- Florid papillomatosis (erosive adenomatosis) of the nipple
- Granular cell tumor
- Inverted follicular keratosis
- Mastocytoma
- Myofibroma
- Nipple adenoma
- Pilar cyst
- Seborrheic keratosis, acanthotic
- Seborrheic keratosis, clonal
- Seborrheic keratosis, reticulated
- Steatocystoma
- Venous lake (not pictured)
- Neural tumors
- Accessory digit
- Neurofibroma
- Neurothekeoma
- Palisaded encapsulated neuroma
- Schwannoma
- Smooth muscle tumors
- Accessory nipple
- Angioleiomyoma
- Leiomyoma
- Vascular tumors
- Angiokeratoma
- Angiolymphoid hyperplasia with eosinophilia
- Glomus tumor/glomuvenous malformation (glomangioma)
- Infantile hemangioma
- Lymphangioma
- Pyogenic granuloma
- Targetoid hemosiderotic hemangioma (hobnail angioma)
- Tufted angioma
- Premalignant lesions/indeterminate biologic behavior
- Actinic keratosis
- Langerhans cell histiocytosis
- Proliferating pilar tumor
- Malignant tumors
- Carcinomas
- Adenoid cystic carcinoma
- Aggressive digital papillary adenocarcinoma
- Basal cell carcinoma
- Basal cell carcinoma, morpheaform
- Bowen disease
- Merkel cell carcinoma
- Metastatic breast carcinoma
- Microcystic adnexal carcinoma
- Mucinous carcinoma
- Paget disease
- Sebaceous carcinoma
- Squamous cell carcinoma, acantholytic
- Melanocytic tumors
- Melanoma
- Melanoma, balloon cell
- Melanoma, desmoplastic
- Miscellaneous
- Atypical fibroxanthoma
- Leukemia
- Lymphoma
- Mycosis fungoides
- Renal cell carcinoma
- Subcutaneous T-cell lymphoma
- Vascular tumors
- Angiosarcoma
- Kaposi sarcoma