About once or twice a month, I see a young male in his late teens or early 20s who come to me to evaluate a bump or lesion on his penis. Interestingly, many of these men have sought evaluation before and STILL don't know what they have.

Here are the most common causes of this symptom:

Have multiple grouped lesions on the penis that are painful? Think about genital herpes as the cause. These lesions can also occur on the buttocks or anal area. The initial outbreak may be associated with...