What is this single bump on penis shaft?

[GuySeekingAnswers]

Hello, this is my first post on this site.
  I am currently experiencing a single pimple-like bump on the right underside of the shaft of my penis and I was wondering what it could be. I have only ever had this one bump and when I touch it, it does cause discomfort. I have not been sexually active since March of this year and this bump has only been there for one week. It is regular in shape and has a smoothish top and no real discoloration. It also feels as though there is fluid inside of it and is roughly 2cm raised above skin level. I have only ever had protected sex though I have received unprotected oral stimulation. Any insight into this would be a tremendous comfort. Thank you!

[lincolnlarrmail]

It is probably a ingrowing hair if you shave and my opinion you SHOULD be sure to apply lots of baby oil on shaved area this will stop razor burn and ingrowing hairs I had one. It sounds like the same as what you have I just squeezed it like a zit and even scraped it with my swiss army knife to get the hair out BE CAREFULL keep shaving the women like it nice and clean

[WillWho]

Go to the Dr. Get it checked. It may just be a zit. It could also be more serious. The younger you are, the better the chance of just being a zit. Go ahead and get the prostate checked while you are there. Make the good Dr earn his pay. :D