Psoriasis capitis. solitary, chronically stationary, sharply defined, silvery scaly plaque that extends beyond the hairline. infestation of predilection sites on the rest of the body
Pityriasis lichenoides chronica. unusually extensive maculopapular exanthema, existing since several weeks. distinct itching. linear arrangement of the efflorescences in places.
Acne conglobata: Con dition after extensive healing of an acute flare of acne conglobata; the aggregated, abscessed acne florescences are still recognizable by the red scars visible here.
Dermatomyositis (V-sign): Characteristic cutaneous symptoms of the backs of hands and fingers, almost proving the diagnosis of "collagenosis", with reddish-livid papules arranged in stripes, which merge to form flat plaques in the area of the end phalanges. Painful nail fold keratoses with parungual erythema are sometimes seen. Such papules arranged on the stretching side are also found in SLE and mixed collagenosis, rarely once in lichen planus.
streptococcal dermatitis, perianal. low infiltrated, well definable, perianal located red plaques and partly erosive, rough papules. sporadic bloody stool deposits. no fever. strong, persistent itching and defecation pain. perinasal impetigo also occurred.
Malasseziafolliculitis: follicle-bound, 2-6 mm large, inflammatory papules and papulopustules on the back of a 53-year-old female patient; secondary findings: melanocytic naevi and isolated seborrheic keratoses.
Acute contact allergic dermatitis with scattering reaction after application of a gel containing diclofenac; linear patterns (Koebner phenomenon) in the upper third of the dermatitis.
Primary cutaneous anaplastic large cell (CD 30+) lymphoma. Painless, slowly progressive skin ulcer (62-year-old, otherwise healthy woman) which has been present for several months and treated as "pyoderma". Conspicuously raised wall of the ulcer and distinct induration of the reddened edges.
Pityriasis lichenoides chronica: 19-year-old, otherwise healthy patient with a papular exanthema on the trunk which has been present for 1 year and runs intermittently. Hardly any itching. No other symptoms.
Melanoma, malignant, acrolentiginous.Here: amelanotic malignant melanoma: Chronic inpatient tumor in an 80-year-old patient, existing since 2 years, localized at a pressure-exposed site, flat, sharply defined, slightly painful, similar to an ulcer, slightly raised, flat, ulcerated. The diagnosis as primary tumor was made by finding a metastasis. Note: The diagnosis of malignant melanoma in the presented case can only be made histologically. Clinically, at best, a suspected malignant tumor can be made, which must be clarified histologically.
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