Necrobiosis lipoidica: chronic, sharply defined, flat, centrally atrophic, smooth plaque with clearly brown-red tinged edges; shining through of the underlying veins is characteristic.
Becker nevus: planar and spatter-like hyperpigmentation, focal hypertrichosis in the region of the lateral thoracic wall in young men; hardly visible at birth, postpubertal expression.
Melanoma, malignant, lentigo-maligna melanoma, bizarrely configured brown-black spot on UV-damaged skin on the nose, centrally low infiltration, development since about 8 years.
Melanonychia striata longitudinalis. 4 months" (realistic is a duration of years) of persistent brown longitudinal stripes on the fingers of the right hand in a 64-year-old Turkish man. Mainly Laugier-Hunziker-Baran syndrome. Malignancy was excluded.
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.
Scleroderma ligamentous: for years slowly progressive, only moderately indurated ligamentous morphea in a 42-year-old woman; no movement restrictions of the joints.
Keratosis areolae mammae naeviformis: Chronically inpatient, for years unchanged, limited to nipple and areola, moderately consistent, symptomless, brown, rough (warty) plaque in a 45-year-old man.
Dyskeratosis follicularis. chronic dynamic, partly loosely disseminated, partly grouped standing, partly aggregated to plaques, brown papules first manifested in childhood. distinct itching with excoriations on the skin lesions.
melanosis neurocutanea. multiple, sharply defined, pigmented, black spots, plaques and nodules on head, upper extremities and upper trunk. in the area of the middle and lower trunk there is a large melanocytic nevus. evidence of leptomeningeal melanosis.
Linea fusca. sharply defined, linear, brown, smooth, non-pruritic hyperpigmentation in a 28-year-old pregnant woman in 24th week of pregnancy. the line runs from the symphysis pubica upwards to the epigastrium. the clinical picture is diagnostically conclusive.
Lichen planus actinus: polygonally limited, hardly itchy Lichen planus; the violet shade of the Lichen (ruber) planus can be found in the marginal area of the plaque.
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