Sarcoidosis: chronic sarcoidosis without detectable organ involvement. Two to 1.5 cm large, anular, completely symptom-free, brown-red plaques with a smooth surface. The distribution pattern on the back of the hand is random.
Parapsoriasis en plaques, large-heart form: a few months after pregnancy, the 39-year-old patient noticed these flat, brownish, blurred plaques on the upper arm.
Lichen planus verrucosus. 1 year old, constantly itchy, blurred, firm plaque with a wart-like surface structure. The clinical findings are to be distinguished from those of a Lichen simplex chronicus (Vidal ).
Epidermodysplasia verruciformis. 34-year-old female patient has had partly erythematous, partly brownish, hyperkeratotic papules in the area of the upper arms and hands since childhood; for some years now, there has been a two-dimensional confluence of the skin changes with complete spread to the palms of the hands. Currently, on both palms (also on the back of the hands and the sides of the fingers) there are partly individual, partly aggregated papules, which are aggregated on the palms to form a large, red, wart-like rough plaque.
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