So my acne flares up time to time and with a little treatment, it goes away in like 2 weeks. I use epiduo and treat it for two weeks and then forget about it for 6 months until i repeat the cycle.

I've run out of epiduo, so I'm using the BP from this site. My skin cleared for the first week then it started to break out and get rough in the next. What the heck is happening here? How long am I supposed to do this for?