A yeast infection or an STD. See your doc ASAP. It won't go away without treatment.
Either fleas or ear mites... : )
Yeast infection...or did you recently change your body soap or detergent?
1% hydocortison cream,wal marts equate brand good.make sure it is max strenghth.about 5.00$
Some evil person spread itching powder around in your underwear drawer.
Dry Winter air. You need a way to get that sucker moist.