The proceedings of the Symposium on Acne which took place during the 20th World Congress of Dermatology in July 2002 in Paris review the current and future aspects of research, clinical entities and treatment of acne. In the foreword by Prof. John S. Strauss (Iowa City) the most important data are summarized. The papers presented are the results of a cooperation of international experts introducing innovative data on epidemiology, comedogenesis and inflammation, acne in infancy, acne genetics, topical and systemic treatment, bacterial resistance, hormonal therapy, and less common methods of acne therapy. This publication equally addresses clinicians and scientists interested in the current and future trends of the treatment of acne as well as the auspicious development acne research will experience.