I noticed a purple bump on the shaft of my penis shortly after I had sex with a woman which I did use a condom but there was some genital contact and brief penetration half way without a condom. It is about twice the size of a typical pimple someone might get on the face, it is not painful and it does not itch. Does anyone know what this might be? I hope it's not an STD.

It doesn't sound like an std but I have no idea u should go to a doctor