i'm 18 and through out my life i have worn underwear like panties (during period) or something like trunks (on regular bases). however, recently, i can't wear them. it is like, there is some allergic problem in between my legs (both sides) and some blue color stains (wish can easily be washed) on my pants. first i thought it was coming from inside but it wasn't. that is because when i wore panty linear, instead of stains being in the middle, they were on the sides. right now my skin, in between my legs, hurts a lot but i have no idea whats up? please help! >_<