Body Acne

I'm 13 and I have the worse back and chest acne! I'm not saying it's the worse out there but it is really bad. I've had it since 4th grade and I'm going into 8th and I've gotten rid of the red bumps now I just have like black scars/spots... I've tried almost everything, does anyone have any tips on how to get rid of this? Much needed thanks ❤️