The problem with Acne is that creams will only ease the symptoms, such as itching, they will not cure the Acne. That has to be done from the inside, which is why a doctor will prescribe tablets, that hardly ever work!
The largest organ in your body is the skin. And it is very delicate as a teenager. It is changing all the time because of the hormones in your body. Another thing which can harm the skin is constipation, so you must be careful of that!