Keratosis

Keratosis
Classification and external resources
MeSH	D007642

Keratosis (from keratinocyte, the prominent cell type in the epidermis, and -osis, abnormal) is a growth of keratin on the skin or on mucous membranes. More specifically, it can refer to:

actinic keratosis (also known as solar keratosis)
hydrocarbon keratosis
keratosis pilaris (KP, also known as follicular keratosis)
seborrheic keratosis

Actinic keratoses are pre-malignant growths. Seborrheic keratoses are not pre-malignant.

References

Cutaneous keratosis, ulcer, atrophy, and necrobiosis (L82–L94, 700–701.5)

Epidermal thickening

Necrobiosis/granuloma

Necrobiotic/palisading	Granuloma annulare Perforating Generalized Subcutaneous Granuloma annulare in HIV disease Localized granuloma annulare Patch-type granuloma annulare Necrobiosis lipoidica Annular elastolytic giant cell granuloma Granuloma multiforme Necrobiotic xanthogranuloma Palisaded neutrophilic and granulomatous dermatitis Rheumatoid nodulosis Interstitial granulomatous dermatitis/Interstitial granulomatous drug reaction

Foreign body granuloma	Beryllium granuloma Mercury granuloma Silica granuloma Silicone granuloma Zirconium granuloma Soot tattoo Tattoo Carbon stain

Other/ungrouped	eosinophilic dermatosis Granuloma faciale

Dermis/
localized CTD

Cutaneous lupus erythematosus	chronic: Discoid Panniculitis subacute: Neonatal ungrouped: Chilblain Lupus erythematosus–lichen planus overlap syndrome Tumid Verrucous Rowell's syndrome

Scleroderma/ Morphea	Localized scleroderma Localized morphea Morphea–lichen sclerosus et atrophicus overlap Generalized morphea Atrophoderma of Pasini and Pierini Pansclerotic morphea Morphea profunda Linear scleroderma

Atrophic/ atrophoderma	Lichen sclerosus Anetoderma Schweninger–Buzzi anetoderma Jadassohn–Pellizzari anetoderma Atrophoderma of Pasini and Pierini Acrodermatitis chronica atrophicans Semicircular lipoatrophy Follicular atrophoderma Linear atrophoderma of Moulin

Perforating	Kyrle disease Reactive perforating collagenosis Elastosis perforans serpiginosa Perforating folliculitis Acquired perforating dermatosis

Skin ulcer	Pyoderma gangrenosum

Other	Calcinosis cutis Sclerodactyly Poikiloderma vasculare atrophicans Ainhum/Pseudo-ainhum

Tumors: Skin cancer, Epidermis (C44.L12–L38/D23.L53-83, 173/216)

Tumor

Carcinoma

BCC	Forms Aberrant Cicatricial Cystic Fibroepithelioma of Pinkus Infltrative Micronodular Nodular Pigmented Polypoid Pore-like Rodent ulcer Superficial Nevoid basal cell carcinoma syndrome

SCC	Forms Adenoid Basaloid Clear cell Signet-ring-cell Spindle-cell Marjolin's ulcer Bowen's disease Bowenoid papulosis Erythroplasia of Queyrat Actinic keratosis

Adenocarcinoma	Aggressive digital papillary adenocarcinoma Extramammary Paget's disease

Ungrouped	Merkel cell carcinoma Microcystic adnexal carcinoma Mucinous carcinoma Primary cutaneous adenoid cystic carcinoma Verrucous carcinoma Malignant mixed tumor

Benign
tumors

Acanthoma	Forms Large cell Fissuring Clear cell Epidermolytic Melanoacanthoma Pilar sheath acanthoma Seboacanthoma Seborrheic keratosis Warty dyskeratoma

Keratoacanthoma	Generalized eruptive Keratoacanthoma centrifugum marginatum Multiple Solitary

Wart	Verruca vulgaris Verruca plana Plantar wart Periungual wart

Other

Epidermal nevus	Syndromes Epidermal nevus syndrome Schimmelpenning syndrome Nevus comedonicus syndrome Nevus comedonicus Inflammatory linear verrucous epidermal nevus Linear verrucous epidermal nevus Pigmented hairy epidermal nevus syndrome Systematized epidermal nevus Phakomatosis pigmentokeratotica

Other nevus	Nevus unius lateris Patch blue nevus Unilateral palmoplantar verrucous nevus Zosteriform speckled lentiginous nevus

Ungrouped	Cutaneous horn

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Keratosis

See also

References