Pityriasis lichenoides chronica. unusually extensive maculopapular exanthema, existing since several weeks. distinct itching. linear arrangement of the efflorescences in places.
naevus anaemicus: congenital, marginal irregularly dissected, white, smooth spots. no redness after rubbing the spot. on glass spatula pressure the borders to the surrounding area disappear. brown colored, intralesional melanocytic naevi (speaks against vitiligo!)
Basal cell carcinoma superficial: Slowly growing, symptom-free plaque with adherent white scales that has been present for several years; a shiny marginal structure is visible on the left margin.
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.
Ink spot lentigo: characteristic criteria are sharp demarcation, dark brown-black reticular lines (pigment network), which are interrupted in places within the lesion (dermatoscopic image)
Graft-versus-Host-Disease, chronic. 56 years old patient with z.n. bone marrow transplantation 2 years ago. since 1 year increasing hardening of the skin. poikilodermatic picture with extensive whitish irritations, reticular hyperpigmentation and bizarre red spots. atrophic (parchment-like) surface epithelium with fine desquamation.
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 rosea in dark skin. A few weeks old, slightly itchy, bran-like scaly exanthema in a young Ethiopian patient. Noticeable is the accentuated brighter border of the plaques.
Melanoma, malignant, nodular. 26-year-old woman was diagnosed with an incidental finding on the back of a solitary, coarse, asymmetrical, pearl-like bordered plaque, measuring 8 x 8 mm and increasing for more than one year. The plaque was pigmented brown-black especially at the edges with a whitish-grey centre and central scaly ruffs. Strong grey-blue streaks and massive pigment network break-offs were visible peripherally under reflected light microscopy.
Nevus, melanocytic, halo-nevus. multiple, chronically stationary, disseminated halo-nevi on the back of a 47-year-old man. the original melanocytic nevi but only shadowy recognizable.
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.
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.
Malformations, vascular: mixedvenous/capillary malformation with a large, subcutaneous venous part; here in a lateral view where the clear protrusion of the neck contour is visible.
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