Thanks for the question. What you re describing is likely normal discoloration that most men have in a variety of forms. If these are not sores or growths, are not painful, and are not bothering you, there is likely nothing at all wrong and nothing to be worried about. It is possible that this is an STD (sexually transmitted disease) such as herpes, gonorrhea, chlamydia, or syphilis, though it is unlikely; if you want to be sure, visit a primary care doctor to get tested for these (a combination of urine and blood tests). Always use condoms as protection during sexual intercourse to prevent STDs. I hope this helps. Dr. Sheppe