About 2 months ago I noticed a small red, pimple like, bump about 1mm wide on the bottom of my penis shaft. i popped it and a little white hard ball came out. after that i was concerned, i have been watching my genitals to see if anymore would pop up. i then noticed a few pearly looking bumps about the same time on the front side of my shaft, i tried to pop these as well but they arent filled with anything and end up leaving a red sore so i stopped. i do have one near the head of my penis though that is irritating, its in the soft part of my skin and when erect during sex can end up being uncomfortable at times, when i touch it, it feels a bit sore and one time the skin around the bump seemed to become dry and irritated, maybe from sex. I want to speak to a doctor but I am not sure what kind of expert i should confront with my problem. These bump are only from the base of my shaft up to the head, I dont notice anything around my pubic area or even my scrotum.