The American Acne and Rosacea Society is dedicated to advancing the science related to acne and rosacea and to enhancing communication between those interested in these diseases. This text is not meant to be a comprehensive treatise on all aspects of acne, but rather to address major points of interest by acknowledged thought leaders in the field in the hope that it will lead to further research, discussion, and refinement of our concepts of both the pathogenesis and the treatment of acne.