I am a boy, 18 years of age. Three days ago, I noticed a small, solid lump about half an inch away from the base of my penis. The lump is just under the skin and I can pinch around the lump and squeeze it. It has no surface openings. It feels like a pebble and it does not hurt when squeezed. The only pain the is present would be the pain from squeezing the skin around it. I have had sex twice in my life and my last session was more than a year ago. Can someone give me insight to this lump of mine?