4.Azelaic Acid

Azelaic acid is called a dicaboxylic acid, which is derived from yeast in wheat, rye, and barley.Azelaic acid is a fairly gentle exfoliant, especially when compared to other acne treatments like topical retinoids. It reduces acne-causing bacteria. Azelaic acid kills Propionibacteria acnes, the bacteria that are responsible for inflamed acne breakouts. This, in turn, reduces redness and inflammation.

Where can buy – It You’ll find it as a gel, foam, or cream in both over-the-counter and prescription products.