Dyskeratosis follicularis (Darier's disease). acuteprovocation of the disease after light dermatitis solaris. no symptoms in areas not exposed to sunlight.
Comedo: multiple, chronically stationary, 0.5-1 mm large, firm, asymptomatic, grey, rough follicular papules with enlarged follicles, localized in the nasolabial fold; sebaceous content can be expressed on pressure.
Lichen myxoedematosus: Densely grouped, skin-coloured, also light-glassy, clearly increased in consistency, hardly itchy, shiny, 0.1-0.2 cm large, non follicular nodules (compare hair follicles and their topographical relationship to the nodules; see also further illustrations). Clear linear arrangement of the nodules.
Syphilis acquisita. papular syphilide: In the 42-year-old HIV-positive male, erythematous papules are present in the area of the glans penis and the inner preputial leaf. Similar skin lesions are found on the whole integument as well as on Palmae and Plantae. 8 weeks before, a painless ulcer with indurated wall had formed on the glans, which healed without therapy.
Reflected light microscopy of a trichoblatoma on the shoulder of a 39-year-old female patient, image from the collection of Prof. Dr. med. Michael Drosner.
Lymphomatoid papulosis of the flexor-sided forearm; within a few weeks a red, painless lump developed, which ulcerated in a central crater-like manner.
Dyskeratosis follicularis: General view: chronically dynamic, on the back localized, partly disseminated, but mostly flat arranged, dirty brown, flatly elevated, very itchy papules and plaques in a 43-year-old patient.
Syphilis Early syphilis: papular , in places psoriasiform scaling, chronic exanthema. Fading erythema is also found in places. Generalized lymphadenopathy.
Prurigo nodularis. chronically active disease pattern, increasing since 5 years. generalized, disseminated, 0.4-2.0 cm large, very itchy, flatly raised or hemispherically raised, rough, red plaques and nodules. numerous excoriations (scratch artifacts). neck, hands and feet are not affected.
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