What could this be I notice a small pimple on the shaft of my penis its near the bottom but kinda in the middle it dosent hurt at all unless I mess with it I have only had sex with 2 people and never unpertected. I tried poping it I couldn't at first an then I did it had some blood I think and like white puss and it look like a black hair I'm not sure ijust want to know what it could be please help