http://www.asds.net/RetinoidsInformation.aspx
American Society For Dermatologic Surgery
In recent years new synthetic derivatives of Vitamin A (retinoids) have been developed for the treatment of various skin conditions, such as severe acne, sun spots, wrinkles, and psoriasis. Some retinoids may even help treat or prevent certain forms of skin cancer. Because of their promise, there has been considerable public interest and demand for these drugs.