Tretinoin is a vitamin-A derivative that has been available for many years. It is known for being able to treat a variety of skin conditions effectively and safely. Most frequently it is prescribed for acne but it may also be used to treat melasma, hyperpigmentation, sun spots, fine lines/wrinkles, and more. One of the more difficult-to-treat skin complaints – stretch marks – may also be helped with topically applied tretinoin…