What Causes A Lump Under The Skin On The Penile Shaft?

I have a hard, smooth, moveable lump underneath the skin on the lower middle of my penile shaft. When attempting to pop/drain it the only thing that comes out its blood like liquid. It does not hurt and is not open. I remember many months ago knicking myself down there when attempting to shave. I thought it might be an ingrown hair but no ingrown hair is visible and its painless like I said. I had one when I was a teenager and like an idiot one day sterilized a needle then popped it and a huge amount of puss came out with a bit of blood. It healed quickly and then never came back. I m beginning to think this is the same thing. Except it s a little different. Originally it started out like an ingrown hair and white puss could be squeezed out but that s no longer the case. It appears the same flaccid and erect. I ve had it now for a couple weeks. Don t have health insurance so I can t see a doctor right now....any ideas?