For Sensitive Skin. Exfoliating is a critical step in skin lightening and brightening because as we age the natural process of cell turnover slows down leaving skin duller, drier and less smooth. Exfoliates the dead layers of the skin for faster cell turnover. Reduce sensitivity and redness. Azelaïc Acid Helps reduce pigmentation, particularly useful for darker skinned patients with pigmented acne scars and melasma (pregnancy mask).