I believe it will always get worse before it gets better. During fasting you are eliminating many toxins out through the skin. Even people who have never experienced skin problems before can during a fast.
My longest fast was 28 days and although I don't typically have breakouts, I was getting them as late as the third week into my cleanse. Of course this will vary from person to person. I'm on day 11 of my current fast and am still getting them.
My best advice would be to hold tight. Your body knows what to do, you just need to give it the time it needs to do it.