I noticed this bump about 2 days ago, but it is very small so it may have been there longer and i have not seen any others. It is not painful or itchy that I can tell, and has not changed in appearance since i noticed it. 23 days ago i had very brief unprotected sex (30 sec -1 min maybe) before i realized what I was doing and stopped, and she said she had no history of STD's, but I do not know her extremely well. Could it be a pimple or irritated spot from chafing? Herpes?