Also, adding that it was on its low cost compared with other more sophisticated treatment. Two of the most frequently used topical creams are the ingredients of benzoyl peroxide and azelaic acid. Benzoyl peroxide. This is simply the most frequently used topical cream. It is three things for their adult acne. It kills bacteria, reduce inflammation and skin also help in unclogging clogged pores. 2.5% concentration of benzoyl peroxide is a commonly used and I personally would recommend that you use a 2.5% concentration, it is nothing greater. 2.5% concentration showed that produces similar effects as an anti-acne adult 10% concentration.