I have to guess it is an erosion, not an arosion, which relates to part of the skin inside the vagina pulling back from a spot where something irritates it. It's often seen if someone has had urinary tract problems especially if there has been surgery, they will sometimes insert an artificial (not human skin or anything) tape, and the vaginal skin will pull back from that, and that's an erosion. I think there is some speculation you can get erosion in the vagina from wearing a tampon several days in a row. Other than that, I have no answers for you, sorry!
maybe this will help,i'm not sure though...good luck.
maybe this will help also...