What Causes Rashes With Menstruation?

every time im on my perid i get a rash from my pads every time i have changed to every pad there is and still brake out i went to my dr and he did blood work to make sure i didnt have anything going on i have been with my hubby for 6 years so i didnt think anything so he put me on fluconazole bec i have yest all the time but i dont feel it or see it ummm i havent tryed the med yet i wanted to try the non chlore pads and still no help uhhhhh have you hurd anythig like this before it dident start until after i had my child in 07 HELP anything i will try it hurts so bad