Common melanocytic nevus. type: Halo-nevus, almost complete regression of the melanocytic nevi, which are indicated as light brown spots in the middle of the pigment-less areas.
Lichen planus mucosae. the histological changes are largely identical with those of the LP of the skin. dense lichenoid infiltrate (epitheliotropy usually not as pronounced as in lichen planus of the skin) mainly consisting of lymphocytes; compact orthohyperkeratosis with low parakeratosis.
Scabies granulomatosa: In a 55-year-old patient, severe itching (especially at night), disseminated, 0.2-0.4 cm large, centrally eroded, red, rough papules with central scaling, especially on the penis and scrotum, gluteal and in the interdigital spaces.
Lichen planus exanthematicus. 32-year-old patient with this clinical picture, which developed within a few weeks and disseminated to the trunk and extremities. 0.1-0.2 cm large, roundish or polygonal, smooth, rough, livid-red, in places whitish papules with a shiny surface. There is distinct itching, but this has not yet led to visible scratching effects.
Psoriasis vulgaris chronic active plaque type: long term pre-existing psoriasis, now relapsing activity (medication?) with disseminated, small psoriatic lesions as a sign of "relapsing activity".
Angiokeratoma circumscriptum. localized vascular malformation with bizarre blue-black papular and nodular lesions. no symptoms. increasing prominence of the herd in recent years.
Acne, steroid acne. reflected light microscopy without contact medium (section: jaw angle region in a 30-year-old bodybuilder): multiple, hypertrophic sebaceous gland follicles with central, keratotic plugs within the ostia, hypertrichosis, transparent horny layer due to corticosteroid-induced hypokeratosis, parallel striated distortion of the skin field lines due to increased transepidermal water loss as well as an ectatic subepidermal vascular network without point capillaries (years of abusus of corticosteroids and anabolic steroids).
Lichen planus (classic type): moderately itchy, disseminated, like scattered distribution pattern, red-violet colour of the surface smooth, shiny papules and plaques.
Basal cell carcinoma nodular: Irregularly configured, hardly painful, borderline red nodule (here the clinical suspicion of a basal cell carcinoma can be raised: nodular structure, shiny surface, telangiectasia); extensive decay of the tumor parenchyma in the center of the nodule.
Lichen planus (classic type): for several months persistent, red, itchy, polygonal, partly confluent, red, smooth, shiny (in places anular) papules on the trunk.
Tufted hairs:Folliculitis decalvans; in the centre mirror-like scarring plate with wicklike hair tufts; in the marginal area of the scarring hair tufts with incised hair shafts.
Dyskeratosis follicularis. reflected light microscopy: section of a lesion on the neck. yellowish-white keratin plaques (orthohyperkeratosis) and areas with ball-shaped, ectatic central capillaries (acantholysis area).
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