Topical Azelaic Acid is a naturally occurring dicarboxylic acid used to treat acne. Although the precise mechanism of action is not known, it is thought to have antibacterial activity against bacteria associated with acne. Azelaic acid displays bacteriostatic and bactericidal properties against a variety of aerobic and anaerobic micro-organisms present on acne-bearing skin. Azelaic acid effects the hornification process of the epidermal cells and is therefore able to exert a therapeutically positive effect on the formation of comedones (blackheads, whiteheads) which occur in acne. Azelaic acid, like Retin-A, is more commonly used in the treatment of acne and other skin conditions. Recently the potential effect of using azelaic acid in the treatment of androgenetic alopecia has been looked at and discussed.