A recent posting to a men’s health forum described a young man with a common problem:

Hi, I am 18 years old, and I just had sex for the first time. We didn’t use protection, but she said she was clean, and I know I don’t have anything. After we were done, I noticed four or five red dots on my penis. The next time I masturbated, they came back, and the whole area around my head turned red. I went to the doctor for testing, but I am still waiting for the results. Should I be worried about...