Shop our best-selling Topicals Faded serum, Paula’s Choice AHAs & BHAs, Niacinamide serums, Good Molecules Discoloration serum, and other acids. Apply serums and acids after cleansing and prior to moisturizing. Each acid has additional benefits such as antibacterial, comedolytic, and anti-inflammatory properties. Acids work on your skin to either control oil production, exfoliate, brighten, unclog pores, reduce fine lines or hydrate your skin