I have gotten what looks to be a pimple on the shaft of my penis. It first started small with a white head but 4 or 5 days later it has gotten red inside of the pimple like it got popped but could not make its way out. It does hurt when I touch it. I have been with my girlfriend for over 2 years and it is the first time either of us have seen anything like this. What could it be? Should I try popping it as if it were a regular pimple? Im very confused and very worried. Thank you very much

You could try popping it but you're most likely to feel pain like you've never felt in your life. It's most likely an irritated pimple, but just in case it is something more serious, you should see your doctor.