Acanthosis

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Acanthosis is diffuse epidermal hyperplasia (thickening of the skin).^[1] It implies increased thickness of the Malpighian layer (stratum basale and stratum spinosum).^[2]

References

↑ Kumar, Vinay; Fausto, Nelso; Abbas, Abul (2004) Robbins & Cotran Pathologic Basis of Disease (7th ed.). Saunders. Page 1230. ISBN 0-7216-0187-1.
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Macroscopic

Primary lesions	flat Macule Patch elevated Papule Nodule Plaque fluid Vesicle Bulla Pustule Ulcer Erosion Telangiectasia Special initial lesions : Burrow Tunnel Comedo Scutulum Target lesion Herald patch Wheal
Secondary lesions	Scale Crust Lichenification Excoriation Induration Atrophy

Microscopic

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

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

v t e Index of skin
Description	Anatomy Physiology connective tissue Development
Disease	Infections by morphology Vesiculobullous Dermatitis and eczema factitial Papulosquamous Urticaria and erythema Radiation-related Pigmentation Mucinoses Keratosis, ulcer, atrophy, and necrobiosis Vasculitis Fat Neutrophilic and eosinophilic Congenital Neoplasms and cancer nevi and melanomas epidermis dermis Symptoms and signs Terminology
Treatment	Procedures Drugs antibiotics disinfectants emollients and protectives itch psoriasis other Wound and ulcer

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