According to the American Academy of Dermatology, acne is the most common skin problem in the United States. It affects approximately 80 percent of people, aged 20 - 30. Retin-A is used to treat acne, zits and other skin conditions. Retin-A reduces the formation of pimples. It enhances rapid healing for new acne and offers better skin care. Retin-A should be used per a medical provider’s instructions. During initial usage, the skin may feel warm, with mild stinging or redness. As the skin adjusts to Retin-A, the effects should subside. A physician should be notified if blistering, crusting, redness, severe burning or swelling of the skin, occur. Tretinoin is the generic name for Retin-A. It’s the preferred treatment for many patients with acne.