For some individuals, acne is a relatively mild problem. For others the large cysts and resulting scars are very disfiguring. Acne is an emotionally charged problem for everyone with these skin lesions. No therapy of acne will make the acne go away and stay. Improvement lasts only about as long at you continue with therapy.
Treatment prevents new lesions.
It doesn't heal those that are already present. After you start treatment, improvement may not be evident for several weeks. You will probably never get your skin to be as clear as you would like it to be. If you still have acne when you are in your 20's, you will frequently have recurrent problems throughout your adult life. The goal of therapy is to improve the appearance of your skin as much as possible.