A scientific study showed that when thirty Caucasian patients thirty five to seventy years old applied Retin a to their forearms for sixteen weeks winkles and roughness disappeared (journal of the American medical association January 22 1988). The doctors called the results dramatic a four year university of Arizona study involving 280 patients suggested that some tretinoins can treat cancers for example cervical cancer retin A’s potential as a skin cancer treatment was a major news item in early 1993 . because of its versatility this cosmetic now treads a fine line between being a beauty care product and a medical treatment.