Well, 2 days ago ago my underwear was rubbing a lot on my vagina and it was really uncomfortable but I was at work so had to deal with it. So I wore thsoe panties for the rest of the day. They kept riding up. When I got home and showered, I felt this sharp pain down there and so I took a mirror and looked to see what it was, come to find out that I had this white blister like thing on the side of my vagina. I dont think its an STD or AIDS, I am SURE of it. but I dont know what it is and I dont know what to do to heal it quickly.