Retin A is the generic form of tretinoin, which is available as a cream. The medicated cream is one form of vitamin A, and is used in the treatment of acne. The cream helps renew skin cells and fight acne. It also comes in a micro gel form, which is used to treat rough, uneven skin texture, tone and pigmentation, and helps smoothen acne affected patchy skin. The cream also helps tighten skin and face off fine lines and wrinkles which are marks of skin ageing. However there are some precautions to be taken while using the cream. And you must know about the side effects too.