Heihei Glycolic acid exfoliates the skin and helps to even out skin tone and pigmentation. It is important to be extra careful with UV protection while using products with acids, as these make the skin more sensitive to UV and HEV light - and thus more prone to new pigmentation Depending on how often you use it in relation to the skin's tolerance, it can take up to 2 months before you see an effect on pigmentation spots Wishing you a super nice day!