i like the word cha-cha its amusing, i think i might go and ask my doc i need cream for my cha-cha and see what he says .
It could be an ingrown hair or an irritation from soap or laundry detergent. Have you tried any different soaps lately? Scince its not itching inside like most yeast infections do, I would try an anti -itch lotion, but if it doesn't go away after a few days it would be best to see the doctor.