Itchy Cycle

Every month around my period, I develop an itchy patch of skin right above my clit, right where my lips come together. 
Does that make any sense? 
It goes away mid-period and doesn't come back until a few days before. 
I have no other symptoms, such as discharge or unusual smells. 
It seems unlikely that I get a yeast infection once a month! 
Does this happen to anyone else? 
Any ideas?