Yeah, bacne sucks. Although my bacne wasn't as severe as yours, I dealt with pesky bumps on my back, shoulders, and upper arms last year. I did three things to make it go away. 1) started taking chinese herbs (i use sunrider products. They helps control your hormones and cleanse you from the inside out) 2) started using proactiv wash on my chest and back and invested in a good sponge. I am a woman of color, so I understand scaring. Darker people produce more melonoma, so it takes longer for marks on us to heal. Using a sponge to exfoliate the skin will help get rid of dead skin cells and prevent clogging of the pores. Don't scrub the pimples, as they will become irritated, but use the sponge on acne prone areas or scars. 3) the last thing helped the most. I stopped washing my hair in the shower. It sounds crazy but the chemicals in my shampoo and haircare products were seriously irritating my skin, so I started washing in the sink.
I did these three things, and I am completely acne free on my body now. I hope this helps!! Good luck