Retin-A is an acne treatment compound (gel or cream-based) that consists of retinoic acid and the active ingredient tretinoin. Repeated application of this causes the outermost layer of skin to thin while simultaneously thickening the epidermis. This process basically provides an expedited yet natural exfoliation of the skin as well as collagen production. However, depending on your skin type and the concentration of Retin-A in the product used, your skin may break out as it is renewed within the first couple weeks of application. Others may experience light face peeling. More serious but uncommon side effects include excessive dryness, redness, and swollen or blistered skin. Check our list below for the 5 Best Acne Treatments!