I had pretty bad, persistant acne in high school and used accutane for 5 months. It was enough to clear up my skin for the most part altogether aside from a stray pimple here and there.
I was worried as shit when I started my first cycle, expecting to have awful break outs, but it never happened.
I noticed two things contributed to when I did develop a few pimples was that I wasn't doing a good job of controlling estrogen. The other is get as much of your liquid intake from water as you can. Stuff like milk, soda/diet soda, gatorade, etc all seem to cause a few pimples.
IIRC, BONEZ has mentioned how he seems to get worse acne from dbol which I think he attributed to the methylestrodiol, so I think like one of the posters above mentioned, it's likely that it's the estrogen that causes acne, not necessarily the androgens. Don't quote me on that, though, just simple speculation, but seems to be the case.
FTR, the acne I had was on my face. I never had bacne or anything else prior to accutane/using and still don't have any, so take that into account for the above advice - IDK if acne on the body is any different than acne on the face.