I started on Tazorac about a month ago. It seemed to go through a mild purging stage, then a sort of red, burning stage, then a flaky stage, then my skin was very cleared up for a couple days. But then the pimples seemed to come back, at least as bad as before if not worse. They seem to be mostly flat this time though. Is this just a second round of purging or is it a bad reaction to the Tazorac?