Suggest Remedy For Oily Skin With Pimples

hello, my 16 year old son has very oily skin, with lots of pimples (black heads, white heads small ones and big ones) on his face, and as I noticed recently on his back and upper arms too. He's using Acne-Aide soap 2x a day on his face (morning and evening) for almost a month now but I notice very small improvement. His pimples got smaller but they never totally left his face. I also noticed his acne got worse after he had chicken pox last year which left marks on his face. What do we have to do to help him?