What Causes Bump At The Base Of Penis?

hello. i recently had intercourse with a sketchy woman. the next day i noticed a bump like thing that I felt under my skin in my pubic/base of my penis area. I got very paranoid and shaved the area. the next day I received a couple of pimples in the area. I am hoping the pimples were due to me constantly touching/examining the area or from razor burn but I am not sure. the woman claims she does not have an std and I used a condom. the pimples were totally gone about three days later (noting that I popped them). it has been about two days over a week and the bump still remains on my pubic area/penis however it is miniscule. I would just like your thoughts.