Psoriasis intertriginosa. solitary, chronically stationary, large, sharply edged, especially after sweating itching, homogeneous, red, rough, scaly plaque. further, similar skin changes on elbows and knees. up to now extreme resistance to therapy.
Pityriasis rubra pilaris (adult type): Sharply set off towards the wrist (difference to hyperkeratotic palmar eczema), alternating, flat palamarkeratosis.
Eczema, atopic. chronic, recurrent, itchy red spots and slightly raised red plaques on the cheeks and forehead of an 8-month-old girl; multiple, disseminated, partly crusty scratch excoriations are also visible.
lupus erythematodes chronicus discoides: already longstanding, blurred, red, butterfly-shaped red plaques. delicate scarring beginning at the bridge of the nose. no systemic autoimmune phenomena.
Toxic epidermal necrolysis. detailed view of a solitary, acutely occurring, perimamillary, sharply defined, slightly weeping, extensive, erosive detachment of the skin. the sample biopsies showed a vacuum-associated interfacial dermatitis with epidermal keratinocyte necroses.
Atopic eczema in children/adolescents: 3-year-old toddler with previously known atopic eczema; for several weeks increasing severe eczematization with excruciating itching, elevated nummular (also borderline) crusty and weeping plaques; evidence of gram-positive coccus.
Psoriasis vulgaris Psoriatic plaques around a larger and smaller (between the senile angioma shown above and the melanocytic nevus shown on the right) seborrhoeic keratoses (see also nevus, melanocytic, Meyerson's nevus).
Chronic hand dermatitis: extensive chronic dermatitis of the back of the hand and the interdigital spaces between the fingers; distinct lichenification and dandruff formation.
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