Hi I have a very small  lump on the top bit of my penis, same colour as my skin with like a black dot in the middle,  in the surrounding I also have some black dots,  that are raised a bit. This has increased from 2,3 to about 6, 7 in the last 4 months. I had a full check up,  where I done a blood and urine test, but it came negative. I had a few unprotected sex a few times before I noticed them. Also, after ejeculating I sometimes feel a slight burning sensation in the top my my penis. I'm really worried can someone help please.

Thank you