cystic acne

Currently my doctor is working under the assumption that a sore I get on my butt cheek is possibly cystic acne. I generally don't go to her without plenty of information so I can ask educated questions about my health; however she stumped me today by instantly agreeing that it's very possible. She asked me about medication that other women with PCOS have take for it to clear it up. I couldn't remember if the couple of people I'd seen talk about having it were here or another group. Anyway basically I'm wanting to know if you have it what does your doctor do for it?