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Psoriasis affects 2% to 3% of American adults. A study of nearly 1700 adults with a dermatologist-confirmed diagnosis of psoriasis found the overall annual sex- and age-adjusted incidence rate to be 62.3 of 100 000 people over a 30-year period (95% CI, 58.8 to 65.8). The annual incidence of psoriasis almost doubled between the 1970s and 2000 (50.8 to 100.5 per 100,000 people; P = 0.001), possibly reflecting increased exposure to risk factors or changes in diagnosing patterns in this population (1).
A. Extensive, well-demarcated erythematous plaques of the abdomen. Psoriasis plaques. B. Erythematous plaque of the elbow. C Erythematous, scaling plaques of the abdomen.
Psoriasis nail changes. A. Oil drop sign of the fingernail. B. Pitting and nail bed hyperkeratosis of the fingernails.
Psoriatic arthritis. A. Swelling of the proximal interphalangeal joints of the second through fourth digits. B. Telescoping of the fifth digit due to severe bone lysis.
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