Cis retinoic acid, a derivative of vitamin A, is categorized as a class of vitamin A, including 9-cis retinoic acid and 13-cis retinoic acid, and is used clinically to treat skin disorders. Cis retinoic acid, a derivative of vitamin A, is categorized as a class of vitamin A, which generally includes 9-cis retinoic acid and 13-cis retinoic acid, and is now more commonly used in the treatment of skin disorders and as an anti-cancer drug. Its generic name is isotretinoin, and the main diseases it can be used to treat are treatment of severe acne, pediatric neuroblastoma, cutaneous T-cell lymphoma, and squamous cell dermatocellular carcinoma, while other clinically applicable diseases are still under research. The use of cis-retinoic acid requires some appropriate tests such as liver and kidney function, blood tests, and the exclusion of certain primary underlying diseases before it can be used. If you need to use this drug, you need to go to a regular hospital for medical treatment and be prescribed by a professional doctor according to your condition, do not blindly use the drug on your own.