I have acne on my buttocks, they leave small marks when they heal but fade, I have tried exfoliating, using an antiseptic acne astringent, beta hydroxy?

Recurrent Folliculit. See PMD. Need to have one of these lesions cultured. Then appropriate ant for a month or two will eliminate the problem. Emperically you can try doxycycline for a month or two. Either way you have to avoid indoor animals, change undergarments daily, and "Iron " your undergarments after washing..........as long as you do this you will not have recurrence.