Figure 1.

Psoriasis and PsA. (A) Psoriasis is associated with a hyperproliferative epidermal layer, abnormal keratinocyte growth, and an inflammatory cell infiltrate including T cells and macrophages. This manifests in inflamed skin and raised plaques with silvery scales and can cover large areas of the body. (B) Glossary of clinical features associated with classification of psoriatic arthritis. Adapted from Bren L. Psoriasis: more than cosmetic. FDA Consumer. 2004 Sept–Oct. Available from: http://permanent.access.gpo.gov/lps1609/www.fda.gov/fdac/features/2004/504_psoriasis.html. Accessed February 8, 2013.63

Abbreviation: PsA, psoriatic arthritis.