I started cerazette a month ago after years on the combined pill. It really is great except I started coming out with cysts on my chin, almost a new one everyday. 5 days ago i made my own toothpaste - essentially fluoride/SLS free and no new spots for about 3/4 days. I really do think that excess sebum (due to the drop in oestrogen when coming off the combined pill) reacts with fluoride to cause cystic lumps.
Google "fluoroderma cystic"