AHA & BHA -AHAs and BHAs are types of hydroxy acids. Both of them are excellent exfoliators and help remove dirt, oil and makeup and give a radiant glow to your skin. Deep cleansing action of both acids prevents clogging of pores and thus prevents acne formation.They help decrease inflammation and appearance of large pores and wrinkles.They even out your skin tone and improve overall skin texture. AHA is also good for dry skin. It's made up of molecules that love water, and it helps improve the skin's moisture content. Beta Hydroxy Acid (BHA) is best for acne-prone skin and those with deeper skin concerns since BHA penetrates further into the skin. While AHAs love water, BHAs love oil. Kojic acid Kojic acid is used to lighten the skin. It is also used to treat skin conditions, such as sun damage, scars, and age spots. The science behind how kojic acid works as a lightening agent involves its effect on melanin production.