Hey everyone--I feel really dumb asking this question but last week I was getting some head and the person was really using their teeth. I have a sore underneath the head on my shaft. Could this be a STD or from having her teeth scrape my jock? It looks like a popped blister. Please help, I dont want to see a doctor and I have been putting neosporin on it and hoping it will clear up. Any thoughts? :confused: