Lactic Acid.
Lactic acid is specifically used to treat hyperpigmentation, age spots, and other factors that contribute to a dull and uneven complexion. Other benefits of lactic acid include improved skin tone and reduced pore appearance. However, unlike glycolicacid, lactic acid is a bit milder.Lactic acid is an antiwrinkle and pigmentation-fighting ingredient found in over-the-counter (OTC) and professional-grade skin care products