Lichen planus (classic type): itchy, polygonal, partially confluent, brownish-reddish papules on the right hand and right wrist of a 40-year-old man, existing for 8 weeks; independent of LP, strong, palmar hyperkeratoses exist, the development of which can be ascribed to the professional activity as floor layer.
Hand eczema atopic: previously known atopic eczema with variable course; the skin lesions on both palms have existed with varying intensity for several years.
Psoriasis palmaris et plantaris (plaque type): red and scaly, markedly indurated plaques on the palm of the hand. Sharp border to the flexor side of the forearm. This sharp transition to the unaffected skin differentiates palmar psoriasis from "hand eczema".
eczema atopic (overview): extensive reddening of the palm. hyperlinearity. disseminated erosions. lichenified eczema foci in the area of the wrist (DD psoriasis palmoplantaris). for further explanations see next figure.
Cutaneous mosaic dermatosis: In a 7-year-old girl erythematosquamous, hyperkeratotic papules and plaques exist in a linear and planar arrangement since birth.
Pityriasis rubra pilaris (adult type): Sharply set off towards the wrist (difference to hyperkeratotic palmar eczema), alternating, flat palamarkeratosis.
eczema atopic (overview): chronic atopic hand eczema. extensive redness of the entire palm. the circled areas show a normal relief of the inguinal skin. non-circled eczematous areas with clear hyperlinearity. in the rectangle lichenified eczematous areas of the field skin.
Hand dermatitis: chronic, dyshidrotic dermatitis of the hand; coarse lamellar desquamation of the palm after an acute flare of the dermatitis has subsided.
Dyskeratosis follicularis: Infestation of the palms of the hands; in central areas of the palm flat, common keratoses, at the ball of the thumb about 0.1-0.2 cm large, glassy papules.
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