I used to get cysts in my 20's and 30's. Nothing seemed to help until I cut out sugar, simple carbs and went on Nystatin. It really made a difference in my skin. I did this for other reasons, but it had a nice side effect on my skin. I noticed a difference for the better in about two months.
Another thing that helped me was to take natural progesterone. I had to take it for about 3 months to notice the full effects.