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!).
Pityriaisis versicolor alba: irregularly distributed, symptomless (slight feeling of tension in the skin) bright spots, which now appeared and were noticed after a sun holiday.
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