The lesson teaches the following:
Clinical Picture of Psoriasis, Introduction: Psoriasis
Psoriasis is a chronic, inflammatory, and proliferative skin disorder in which both genetic and environmental factors play important roles
Fonacier LS, Dreskin SC, Leung DYM. Allergic Skin Diseases. J Allergy Clin Immunol. 2010;125:S138-49. pg s143 p4
Menter et al., J Am Acad Dermatol 2008;58:826-850, p828
Neimann AL, Porter SB, Gelfand JM. The Epidemiology of Psoriasis. Expert Rev Dermatol. 2006;1(1):63-75. (Pg 64, col 2, para 2)