Molluscum contagiosa: colourful picture with multiple, 0.2-0.3 cm large, yellowish, firm, shiny, sometimes itchy nodules, sometimes small scars and crusty papules (spontaneously healed molluscs).
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.
Mucinosis follicularis: acute clinical picture developed after heavy sweating; multiple, generalised, 0.1 cm large, itchy, skin-coloured, pointed conical, rough papules bound to follicles.
Dermatitis herpetiformis. detailed view of several, chronically active, disseminated papules, red spots and vesicles localized at the integument and accompanied by severe pruritus. characteristic is the occurrence of different types of efflorescence. similar skin lesions are also found gluteal and on both thighs.
Granuloma anulare perforans, general view: Skin-coloured to reddish, rough, smooth, peripherally extending, centrally sinking, non-itching nodules on the back of a 40-year-old man.
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".
Basal cell carcinoma, pigmented, black-brown stained, painless nodule with central erosion as well as marginal black-blue papules, which are arranged in a pearl necklace. Clearly actinic damaged skin.
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).
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