It can take time to get acne under control. Keep using the same treatment for 6 to 8 weeks. Some butt acne medicine investigators believe that true cysts rarely occur in butt acne medicine, and that (1) the lesions called cysts are usually severely inflamed nodules, and (2) the term nodulocystic should be abandoned. Regardless of terminology, this is a severe form of butt acne medicine that is often resistant to treatment and likely to leave scars after healing. There are only two types of acne scars. The simplest scar is nothing more than a spot of skin bearing a brown, pink or purple color, testimony to the fact that a pimple had been there.