Acanthosis

Not to be confused with acantholysis or acanthocyte.

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.
↑ M. S. Stone; T. L. Ray (September 1995). "Acanthosis". DermPathTutor. Department of Dermatology, University of Iowa. Retrieved 17 May 2012.

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

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