Hi, Yesterday I had sex twice with this guy I m seeing and we ve briefly tried anal, but it was too painful to continue. We also had oral sex as foreplay, and afterwards I had been experiencing a burning sensation. It s been really uncomfortable so I took a look and it appears that I pinky nail sized cut a few centimeters above my anus. It doesn t really look like sores per say because there is only one and it looks like a popped blister that you would likely to get on your foot. Could this actually be a friction sore, or should I be worried that it is herpes?