I have sebaceous Prominence on the right side of my shaft. Every 3 or 4 months i see them (usually in the same area or the same one) turn slightly red and raised and form a small whitehead with a little puss which i just rub away. Its directly on the tiny little cyst. The redness goes away within a day but it comes back and does the same thing a while later.

It doesn't hurt, maybe a little itch but no pain. Could this be an STD? I'm afraid of what it could be.

Thanks for the help