Urticaria pigmentosa (overview): Adult form of Urticaira pigmentosa (erythroderma), with a history of many years, continuous increase in the density of spots, course over 7 years.
type I neurofibromatosis, peripheral type or classic cutaneous form. since puberty slowly increasing, soft, 0.2-0.8 cm large, skin-coloured or slightly brownish, painless, flat or hemispherical papules and nodules in a 42-year-old patient. the bell-button phenomenon can be triggered (the papules can be pressed into the skin under pressure). café-au-lait spots up to 7 cm in diameter also appear on the trunk.
Parapsoriasis en plaques, large: symptomless, well limited. disseminated stains and plaques. When the skin is wrinkled, a cigarette-paper-like pseudoatrophic architecture of the skin surface is visible (important diagnostic sign!).
Urticaria pigmentosa: General view: about 0.5-1.0 cm large, disseminated, roundish, brownish-red spots. Only when rubbed, the spots redden more strongly with accompanying itching. Increased reddening and itching even in warm showers or baths.
café-au-lait stains. reflected light microscopy: detailed view from a lesion on the thigh in a 36-year-old woman. light brown, double contoured reticulation pattern as well as intact skin field lines. no other structural features.
Pemphigoid, bullous. general view: state of healing. Disseminated, sharply defined or confluent, brownish or livid, postinflammatory hyperpigmentation in a 55-year-old female patient.
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