https://genericbucket.com/product/a-ret-0-1-gel-tretinoin-0-1/ A-Ret 0.1% Gel belongs to the class of drugs known as retinoids (synthetic or man-made vitamin A). A-Ret 0.1% Gel is primarily used to treat acne (pimples) and sun-damaged skin. Acne is a skin condition that is common and occurs when hair follicles are blocked with dead skin cells and oil.