Lichen planus exanthematicus. 4 months old, distinctly itchy exanthema with pinhead-sized, slightly raised, partly isolated, but also aggregated to larger plaques, smooth, shiny, red papules. Streaky arrangement of the efflorescences in scratch or rub marks (Koebner phenomenon; seeleft half of the buttocks).
Acne vulgaris (overview): recurrent, multiple, disseminated standing retention cysts of 0.3-1.2 cm size on the back of a 38-year-old mansince adolescence; multiple black comedones (blackheads) are also present.
Xanthomas, eruptive:disseminated, 0.1-0.3 cm large, yellow-brown, flat raised, superficially smooth and shiny, firm papules in dense seeding in a 54-year-old patient with known hyperlipoproteinemia type IV.
Dyskeratosis follicularis (Darier's disease). acuteprovocation of the disease after light dermatitis solaris. no symptoms in areas not exposed to sunlight.
Lichen myxoedematosus: Densely grouped, skin-coloured, also light-glassy, clearly increased in consistency, hardly itchy, shiny, 0.1-0.2 cm large, non follicular nodules (compare hair follicles and their topographical relationship to the nodules; see also further illustrations). Clear linear arrangement of the nodules.
Transitory acantholytic dermatosis (M.Grover): moderately itchy clinical picture with disseminated itchy papules and also papulo vesicles, which has been present for a few weeks; Nikolski phenomenon negative.
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