A study of U.S. women suggests that vigorous physical activity may be associated with a reduced risk of psoriasis, according to a report published Online First by Archives of Dermatology, a JAMA Network publication. Psoriasis is an immunologic disorder characterized by systemic inflammation and scaling of the skin. Physical activity has been associated with a decreased risk of disorders characterized by systemic inflammation, including type 2 diabetes, colon cancer, coronary artery disease and breast cancer, according to the study background.