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I had this problem too up til a year ago when I asked my derm about it. He told me that for some people salicylic acid works and for some people benzoyl peroxide works. I use both and that cleared it up for me. Worked on my chest and ass too just sayin.
What I use is Neutrogena BodyClear Body Wash (salicylic acid) and a bar of PanOxyl soap (benzoyl peroxide). You might wanna just try one first though in case it's too harsh for your skin.
They also say like wear cotton breathable clothing and keep clean and all that but you probably knew that.