TY - CHAP M1 - Book, Section TI - Psoriasis, Psoriasiform, and Pityriasiform Dermatoses A1 - Saavedra, Arturo P. A1 - Roh, Ellen K. A1 - Mikailov, Anar PY - 2023 T2 - Fitzpatrick’s Color Atlas and Synopsis of Clinical Dermatology, 9e 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 7% to 25% of psoriasis patients. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/11/02 UR - dermatology.mhmedical.com/content.aspx?aid=1199568669 ER -