I have small pimple like bumps on and around the lower part of my penis shaft. I have never experienced any such thing before. I believe it's some sort of infection. They are small and white in colour so maybe filled with pus too. I have had this condition for some time now(2 weeks). Though it is improving, I doubt that it might not have cured itself and might come back again. I shave and I have an active sexual life. I have had many previous unprotected sexual encounter with multiple partners in the past 6 months.