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Psoriasis

Translation
Psoriasis
: A reddish, scaly rash often located over the surfaces of the elbows, knees, scalp, and around or in the ears, navel, genitals or buttocks. Approximately 10-15% of patients with psoriasis develop joint inflammation (inflammatory arthritis). It is caused by the body making too many skin cells, and in some cases it is believed to be an autoimmune condition. Treatment options include topical steroid creams, tar soap preparations, and exposure to ultraviolet light. See also psoriasis, guttate;
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A common multifactorial inherited condition characterized by the eruption of circumscribed, discrete and confluent, reddish, silvery-scaled maculopapules; the lesions occur predominantly on the elbows, knees, scalp, and trunk, and microscopically show characteristic parakeratosis and elongation of rete ridges with shortening of epidermal keratinocyte transit time due to decreased cyclic guanosine monophosphate. [G. p., fr. psora, the itch]
- p. annularis, p. annulata SYN: p. circinata.
- p. arthropica p. associated with severe arthritis resembling rheumatoid arthritis, although serum rheumatoid factor is absent.
- p. circinata p. in which healing is taking place at the center of the lesion while the process continues at the periphery, producing a ring-shaped or annular lesion. SYN: p. annularis, p. annulata.
- p. diffusa, diffused p. a form of p. with extensive coalescence of the lesions.
- exfoliative p. exfoliative dermatitis developing from chronic p., sometimes resulting from overtreatment of p..
- flexural p. p. involving intertriginous folds, e.g., axillary and inguinal skin, which may resemble seborrheic dermatitis.
- generalized pustular p. of Zambusch SYN: pustular p. (1).
- p. geographica p. gyrata in which the lesions suggest the coast outline on a map.
- p. guttata p. occurring abruptly in round patches of small size; seen in young persons following streptococcal infections.
- p. gyrata p. circinata in which there is a coalescence of the rings giving rise to figures of various outlines.
- p. nummularis p. in which the lesions are discrete and discoid.
- palmar p. patchy, hyperkeratotic p. affecting contact points of the volar surface of fingers and palms, alone or with mild p. elsewhere; believed to be an isomorphic response, it may affect one palm involved in a sport or occupation.
- p. punctata p. in which the individual lesions are papules, each red in color and tipped with a single white scale.
- pustular p. 1. an extensive exacerbation of p., with pustule formation in the normal and psoriatic skin, fever, and granulocytosis; sometimes precipitated by oral steroids; SYN: generalized pustular p. of Zambusch. 2. a local pustular eruption of the palms and soles, occurring most commonly in a patient with p.; difficult to distinguish from acrodermatitis continua.

Medical dictionary. 2011.

  
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