I don't know whether this fits your situation or not, but, after 1+ years on mino daily, my daughter got horrible acne. She never had acne to speak of, but this was covering her face,chest,upper back, and upper arms. We were mortified. It began about six weeks after she moved away to college. We assumed that stress triggered it. Well, I read a post on the old RBF BB from an older man who was having a simular problem and it turned out to be yeast. Well, I asked Jess if she had been taking her probiotics and the answer was No! Well, she got back to taking the probiotics, but by that time, it wasn't enough. A week or so later she ended up with a girly yeast infection. She went to the doctor, got an RX for diflucan and within two days of the first one pill dose, her skin was at least 50% better. After she took the second pill one week later, the acne was gone.
So consider yeast.
Good luck!
Cheryl Ferguson