tried acne medication like clearasil or somthing?

no i havnt, i wasnt sure wether or not it would irritate my back because its for the face?
There hard to reach loL! ive looked up on other sites and people are saying exfoliation?

Could someone let me know if this could just be the fact im sweating at the gym?

I think exfoliation will help a little but it will not stop the acne and may irritate broken skin so don't do it too much. I have only recently developed acne on my lower buttocks, upper thighs and am trying everything. Clearasil didn't work but its worth a try, I wouldn't worry that its targeted for facial acne, its not that strong. I've just started using a low dose antibiotic cream recommended by pharmacist for all types of acne.
I suspect that in both our cases the acne is aggravated by the body being heated (during exercise) getting sweaty and then drying out a little before a shower. NB some soaps aggrevate acne so use a PH neutral soap when you shower.