It is unlikely that the small cut is herpes, but it is not impossible. Sometimes people who have genital herpes may also have oral herpes. Herpes can sometimes appear like a small painful cut or fissure, and not like the typical pimple-like herpes that most people are more familiar with. So it is possible that what you have is herpes. However, based on your description, it doesn't sound like it. However, the only way to find out is to go to your doctor and get it checked out, and maybe do some cultures and blood tests to check for herpes. I hope you hear good news when you get tested., Remember to always use protection when you have sex, even oral sex, so you have less risk of getting disease like herpes.