Melanosis neurocutanea. general view: Huge melanocytic nevus occupying nearly the whole back with single, dark-black pigmented, partly exophytic-papillomatous parts; on the left back flat, soft, skin-coloured tumours (dewlaps) and some neurofibromas are visible.
Bowen's disease:long-standing, slow-growing, sharply defined large-area, sometimes erosive, sometimes scaly, less symptomatic, sometimes slightly burning, red plaque.
Candida granuloma: Recurrence at the forearm extensor side in a 28-year-old patient 1 year after complete regression of the granulomas under antifungal systemic therapy.
Cellulitis eosinophil: acute formation of circumscribed, large, sharply margined plaques The surface of the plaques may have an orange peel-like texture (see following figure)
Acrodermatitis chronica atrophicans: Initially flat, oedematous, livid red plaques; beginning transition to pronounced, flaccid atrophy with typical wrinkling of the skin (cigarette-paper phenomenon) and clearly translucent vein networks.
Vulvitis chronica circumscripta plamacellularis: Chronic, painful, deep red inflammation of the labia minora, urinary incontinence, malignancy can be excluded, but due to the symmetrical "imitation"-like distribution, it is clinically unlikely.
Primary cutaneous follicular center lymphoma: coarse, painless, solid tumor, clearly elevated above the skin level, grown within 3 months, two smaller smooth, shiny tumors in the immediate vicinity of the arm.
Keratosis palmoplantaris circumscripta seu areata: Lateral view: Since birth existing, verrucous, hyperkeratotic plaques on digitus III of the left hand in a 10-year-old female patient.
Candida sepsis. multiple, chronically active, generalized (facial involvement is partial manifestation), disseminated, partly isolated, partly confluent, brown-black, rough papules and plaques. coarse scales and crusts on the surface. underlying HIV infection and high fever
Acanthosis nigricans benigna: blurred brown-black spots and plaques. the plaques are characterized by a slightly sooted, leathery surface. no subjective symptoms.
Mycosis fungoides of the "pagetoid reticulosis" type. slight tendency to progression. blander clinical course over years with intermediate complete remission. typical clinical picture with the girlad-like limitation
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