Tretinoin is a medication derived from vitamin A, commonly used in dermatology to treat acne and improve signs of skin aging. What it does Tretinoin speeds up skin cell turnover. That means it helps the skin shed old cells and produce new ones more quickly. This can: * Unclog pores and reduce acne * Fade post-acne marks and uneven pigmentation * Smooth rough skin texture * Reduce the appearance of fine lines and wrinkles * Improve sun-damaged skin over time