contact dermatitis toxic: 41-year-old female patient who noticed these painful striated red plaques after accidental contact with a corrosive fluid. the configuration of the efflorescences is evidence of an exogenous mechanism. the "unphysiological" stripe pattern completely excludes endogenous triggering.
Psoriais pustulosa generalisata: pustular exanthema that develops within a few weeks in patients with known psoriasis; the figure shows a state already in the process of healing with a racy flake detachment
Giant keratoakanthoma: 4 cm in diameter large, painless lump with peripheral lip formation and central horn plug. Initial rapid growth, now no detectable size growth for several months.
dermatitis, seborrhoeic: 58-year-old patient with negative self- and family history of psoriasis. recurrent HV in the seboohoeic zones of the trunk for years. no itching. improvement in summer. multiple, chronically inpatient, figured, borderline, temporarily itching, moderately scaly, clearly borderline hardly elevated plaques.
Nummular Dermatitis: General view: For about 6-7 years persistent, strongly itching, solitary or confluent, coin-sized, infiltrated papules and plaques on the back of a 75-year-old female patient; in some cases small, dot-shaped, white, disseminated, atrophic scars are visible.
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.
Malasseziafolliculitis:multiple, acutely occurring, dynamic, disseminated, follicle-bound, 0.2-0.6 cm large, inflammatory red papules and papulopustules on the back of a 53-year-old female patient. Severe seborrhea, following acne vulgaris in young adulthood; secondary findings include melanocytic naevi and isolated seborrheic keratoses.
Dermatitis herpetiformis: Multiple, prickly, itchy, scratched excoriations on the buttocks of a 35-year-old female patient. 1 year of intermittent progression.
Common melanocytic nevus:Symmetrically structured melanocytic compound nevus of junctional and dermal cell nests with basal maturation coveredby papillomatous squamousepithelium. The nests are superficially discontinuously pigmented, accompanied by melanophages. The squamous epithelium is narrowed and with elongated reticules, covered by lamellar hyperkeratosis.
Extension along the hair follicles in strands, here partly neuroid cytomorphology of melanocytes.
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