Painful skin

Sj • Just a college girl facing the big ol' world. Currently in a ldr with the man of my dreams❤️
Whenever I've been on my period for about two days, I get a rash. Then after I get off it, I get really dry skin down there and they both cause mega pain. I almost always use pads so I changed brands to see if it would help but it didn't. Does anyone have this problem or have advice?