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Glossary:

Psoriasis

A common dermatologic 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

Psoriatic Arthritis

A form of polyarthritis (ie, affecting more than one joint) that occurs in patients with psoriasis; the arthritis resembles rheumatoid arthritis but is seronegative for rheumatoid factor and often involves the digits.

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References:

  1. 95 Lebwohl MG, Bachelez H, Barker J, et al. Patient perspectives in the management of psoriasis: results from the population-based Multinational Assessment of Psoriasis and Psoriatic Arthritis Survey. J Am Acad Dermatol. 2013. doi: 10.1016/j.jaad.2013.12.018.