Erythema anulare centrifugum: multiple, chronically active, centrifugally growing, ubiquitous (here localized at the trunk), slightly itchy, red, rough, scaly, solid, anular plaques. The edges of the plaques are palpable like a wet "wool thread". There is a recurrent intestinal candidosis in the shown case.
Exfoliatio areata linguae: Chronically dynamic, since 5 years alternating, map-shaped, coating-free, red, smooth areas, which are delimited by a raised and whitish swollen rim.
Hand dermatitis: chronic, dyshidrotic dermatitis of the hand; coarse lamellar desquamation of the palm after an acute flare of the dermatitis has subsided.
Neck fistula and cyst, lateral. solitary, chronically in-patient, 2.5 x 1.5 cm in size, clearly increased in consistency, red, rough plaque with an opening for the fistula. occasional slight oozing.
Keloid. 20-year-old patient. acne vulgaris known since puberty. weeks to months after the development of acne papules, development of these papular or knotty elevations of the skin. on the trunk and upper arms of varying thickness, protruding above the surroundings, sharply set off, plate- or bulge-like, very rough, brown to brown-red, occasionally painful, smooth papules, plaques and nodules.
Tinea corporis. several, acutely appeared, oval, red, scaly, at the rim accentuated, towards the centre fading, itchy, flatly elevated, scaly plaques on the integument of a 12-year-old boy. the mother reported that the guinea pig's fur had also changed in a scaly way, a treatment of the animal was recommended
Lichen planus. chronically active, multiple, increasing, disseminated standing, partly confluent, first appearing about 6 months ago, mainly localized at the inner edge and back of the foot, 0.3-0.6 cm large, itchy, red, smooth, shiny papules in a 46-year-old woman. similar papules appeared on both inner wrist sides. Furthermore, a whitish, net-like pattern of the buccal mucosa of the mouth appeared.
Dermatosis, acute febrile neutrophils. following high fever in a 36-year-old woman, acutely occurring multiple, reddish-livid, succulent, pressure-dolent, infiltrated papules confluent to nodules and plaques. overall generalized picture with emphasis on extremities and trunk.
Lupus erythematosus, subacute-cutaneous, general view: Multiple, solitary and confluent, small to large, only slightly elevated, little scaly papules and plaques.
Bowen's disease with transition to Bowen's carcinoma: solitary, size-progressive plaque that has been present for several years, occasionally accompanied by itching, sharply and arc-shaped, border-emphasized plaque with increasing verrucous nodular formation (see following figure).
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