Differin and
Clean & Clear
When I was your age, I had horrible acne. It was on my face, neck, back... ugh it was awful! I started using Differin and Clean & Clear and in about 4 months, my skin cleared up.
Now, you need to understand, the reason why you have acne is because you're 15 years old and still going through puberty; your hormones are going crazy. Once you are fully developed and your hormones even out, your acne will subside (most likely when you're 17 or 18).
EDIT: Also, you gotta shower
every day! Use a
loofah on your back; doing so will help strip away the dead skin.
When it comes to skin care, ask a gay guy.