I know how you feel. I have suffered from terrible acne. I was supposed to use benzamycin which is prescription cream, you can get it from a dermatologist. It helps to reduce the pimples by stopping the growth of acne-causing bacteria. This process took couple of months, but showed satisfactory results. My skin is perfectly clear now. Before applying this cream, wash the complete areas, rinse with warm water, then dry. Apply a thin layer of this cream as directed by your doctor, usually twice daily.
In such cases mostly what i heard about from doctors i.e we should avoid eating fast food , Junk food, soft drinks, or foods like which contains more acidic ingredient into it. During this phase we should mostly depend on natural food, keep maintain water level proper into body.
My best friend of 23 is suffering from light version of acne since 16 years. This issue seriously limits his social life, because he's so insecure