RT Book, Section A1 Tannous, Zeina A1 Avram, Mathew M. A1 Tsao, Sandy A1 Avram, Marc R. SR Print(0) ID 1175823563 T1 Psoriasis T2 Color Atlas of Cosmetic Dermatology, 2e YR 2011 FD 2011 PB The McGraw-Hill Companies, Inc. PP New York, NY SN 9780071635035 LK dermatology.mhmedical.com/content.aspx?aid=1175823563 RD 2024/04/17 AB Psoriasis is a common chronic inflammatory disease of the skin. They are symmetric in distribution and favor elbows, knees, scalp, retroauricular skin, and intertriginous areas. Many clinical variants exist and include plaque psoriasis, pustular psoriasis, guttate psoriasis, inverse psoriasis, and erythrodermic psoriasis, with the plaque variant being the most common type (Figs. 56.1 and 56.2). Nails and mucous membranes can be affected. Psoriasis is associated with psoriatic arthritis in at least 5% of patients.