Folliculitis keep coming back. Sir.

Follculitis keeping coming back above anus region for both sides(not just near to anus).first it will come to left or right side and take 4-7 days to cure those are small red bumps at first and after same small amount of pus leak ,sometimes they only appear red bumps and gone ,then it will come to other side.i consulted doctor take medicines it cure in 1 week then after 1month same they reappear approx same area(the area last time red bump appeared) and same process it ome again on other side ,medicines etc.. It's been 6 months they keep coming-doctor said staph bacteria cuz of sweat-iam not wearing any tight jeans very lose pant and not wearing even innerwear iam not going anywhere just staying at home completed college so no sweat too daily bathing with antibacterial natural soap.Idk why they reappearing what's the problem is there any tests to make sure particularly what kind of bacteria and what wrong why they keep coming! sir.