RT Book, Section A1 Wolff, Klaus A1 Johnson, Richard Allen A1 Saavedra, Arturo P. A1 Roh, Ellen K. SR Print(0) ID 1140789131 T1 PSORIASIS, PSORIASIFORM, AND PITYRIASIFORM DERMATOSES T2 Fitzpatrick's Color Atlas and Synopsis of Clinical Dermatology, 8e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781259642197 LK accessmedicine.mhmedical.com/content.aspx?aid=1140789131 RD 2024/10/16 AB Psoriasis affects 1.5 to 2% of the population in Western countries but has worldwide occurrence.A chronic disorder with polygenic predisposition and triggering environmental factors such as bacterial infection, trauma, or drugs.Several clinical expressions. Typical lesions are chronic, recurring, scaly papules, and plaques. Pustular eruptions and erythroderma occur.Clinical presentation varies among individuals, from those with only a few localized plaques to those with generalized skin involvement.Psoriatic erythroderma is psoriasis involving the entire skin.Psoriatic arthritis occurs in 10 to 25% of patients.