What could a single small red bump on the penis be due to?

Hello doctor,

I am a 30 year old male who is sexually active. I seem to have developed a single small red bump on the head of my penis right after having sex. I have had a yeast infection on my penis head before. So, I assumed it was that again after having prolonged sex. I did not use a condom and I have been with her for three years now. I had sex with one other person two months ago, but that was protected and no oral sex was performed. I have a Betamethasone and Clotrimazole ointment with me. So, I have been applying that for a day now. The redness has gone away, but the bump is still there. It is painless and does not cause any sort of discomfort or discharge. Before this, I did not have sex for five weeks. I clean my penis every day and I never noticed this red bump before having sex. I am afraid it could be herpes but, I am not sure if I can get a herpes bump that quickly. This has me really stressed out and I do not know what to do. Could this be herpes or genital warts? I do have a picture. In the picture, you can see the edges of the bumps are slightly pinkish followed by a white rim. The bump is the size of the full stop symbol on your phone's keyboard. There are no other bumps around it.