Pityriasis lichenoides chronica. unusually extensive maculopapular exanthema, existing since several weeks. distinct itching. linear arrangement of the efflorescences in places.
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.
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.
Pityriasis lichenoides et varioliformis acuta. acutely occurring "colorful" exanthema after febrile infection with differently sized papules measuring 0.2-0.8 cm, papulovesicles, erosions, and encrusted ulcers. healing with formation of varioliform scars.
Keratosis actinica, keratotic type: In a 75-year-old male patient, adherent keratotic plaques have increasingly developed over the last few years, the mechanical detachment of which is painful; here flat ulcers, crusts, scars.
Transitory acantholytic dermatosis. 6-8 weeks of slowly progressive moderately pruritic, truncal exanthema in a 53-year-old man. Red, 2-5 mm large, flat papules confluent at the sternum to plaques of about 3 cm diameter.
Dermatitis herpetiformis. disseminated, mostly eroded papules (vesicles not detectable here!) on the elbow and the extensor side of the forearm. recurrent course for months with tormenting, prickly itching.
Lichtermatosis polymorphic: Occurrence of clinical symptoms a few hours to days after (single and first-time) intensive sun exposure with itching and burning, disseminated papules and papulo-pustules also papulo-vesicles.
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