What are some small and easy things to do that could help get rid of stubborn back acne? Please answer!! ..read additional details.

I've had stubborn back acne for the past two years, and it just doesn't seem to go away. Its embarrassing because I can't wear those cute shirts and outfits I would like to wear. I have good hygiene and wash daily. I can't seem to understand what I'm doing wrong. I have tried almost every prescription out there. I'm starting to think it may be some kind of reaction to my sweat. I sweat on my lower back and that seems where it breaks out most. Also, I had a softball game and right after I noticed I had small bumps along the outline of my bra at where the sweat had been trapped. If you have any info about this please list. Thank you so much for taking your time to help me.(:

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