Looking for either anecdotal or actual evidence here, whatever exists!!

When do skin flare ups/break outs occur within the cycle?

Is there some sort of peak in hormones at a particular point of the cycle? Or does it vary from women to women?

Gross generalizations welcome

I'm asking because I don't have AF back yet but I am noticing my skin has started playing up a bit and wonder if AF is near by...

Any ideas?