Chemical peels have been performed for decades, and they’re generally safe and effective. In some cases, you may have side effects, but these are usually very mild if the person performing the peel is an experienced dermatologist. Side effects may include: Redness that may last several months Darkening of the skin, which is temporary Lighter skin Scarring, which is very rare when done correctly If you don’t carefully follow the aftercare instructions from your dermatologist, these side effects may be more serious, and infections may occur, resulting in scarring.