I have one single red ulcer near my anal cavity. It is small, not painful, and never began as a white pimple or as a cluster of pimples. I went to the doctor where an np did an exam. She said she saw no bacteria under the microscope and drew blood for herpes, gonorrhea, and chlamydia tests. She said it looked like herpes to her but tests would have to confirm. But she also said I had anal fissure from anal intercourse and that the two sores looked different and she didn t seem sure. Like I said I don t have typical herpes outbreak symptoms and this would be the first outbreak if it were to be herpes. No blisters, it did not spread past the single ulcer even though I touched it. She mentioned syphilis at the visit but seemed to rule that out when she didnt see anything under the microscope. I do not have any vaginal symptoms at all. It hurts to have a bowl movement because of the anal fissure but that was present the day after the intercourse not multiple days to weeks. What do you think this is?