Psoriasis vulgaris chronic-inpatient (plaque type): white-yellow, hyperkeratotic plaques on toes and the back of the foot that have been present for several months; no itching.
AIN: perianally localized, less sympotmatic, extensive, whitish erosive plaque at 3 o'clock; secondary findings anal fissure at 6 o'clock (actual cause of the doctor's visit)
Acanthosis nigricans maligna: generalized infestation with acquired (since 1-2 years existing), hyperkeratotic, beet-like aggregated, warty, papules and plaques on symmetrical hyperpigmentations; known and advanced anal carcinoma.
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