Chondrodermatitis nodularis chronica helicis, a solitary, spontaneously occurring, for 3 weeks painful, acute, increasing, coarse, reddish, approx. 0.4 x 0.5 cm large, centrally yellowish encrusted nodule localized at the upper edge of the auricle in a 58-year-old man.
Urticarial vasculitis. 33-year-old female patient with distinct reduction of the az. 3 weeks of recurrent febrile attacks (CRP and SPA massively increased) and a distinct feeling of illness accompanied by a maculo-papular, moderately itchy exanthema. Histological: Evidence of a leukocytoclastic "small vessel vasculitis". The clinical differentiation from urticaria is possible by marking a persistent efflorescence for several days (marking test). Recurrent and changing arthritis.
Naevus araneus: in the 43-year-old man there are isolated red spots, 0.1-0.2 cm in size, and red, smooth papules with a central arterial nodule and radiating capillary ectasia.
Nodular or nodular basal cell carcinoma. Relatively inconspicuous, non-symptomatic, red nodule with a smooth surface (see reflected light image as inlet). The bizarre (tumor) vessels of the basal cell carcinoma become visible in reflected light.
Dermatosis acute febrile neutrophils: acute, exanthematic clinical picture with affection of face, neck, trunk and extremities; here a detailed picture of the thighs with red, succulent papules.
lupus erythematodes chronicus discoides: 18-year-old otherwise healthy patient. skin lesions since 12 months, gradually increasing, no photosensitivity. disseminated, chronic, touch-sensitive, red , differently sized plaques with rather discrete scaling. histology and DIF are typical for erythematodes. no positive ANA and ENA.
Prurigo simplex subacuta:generalized, permanent clinical picture with disseminated, 0.2-0.5 cm large, severely itching, firm, red papules with central erosions or crusts; no disturbance of the general condition.
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