Well, I'm really stupid. I have had a lump on the top of the shaft of my penis for almost a year now. It has been scaring the out of me and I'm to nervous to see a doctor, though I know it is very important that I do. I was wondering if you could explain to me if it is cancer or not. It seems to only be visible with an erection and when it is visible I can move it around with my finger. If I push it to the left hand side of my shaft it appears to be no longer visible, if that makes any sense to you or not. The best way to explain it would be as if there was a small pebble located underneath the skin on the shaft. There is no pain associated with the lump. I am currently sexually active but this has been on my penis since I engaged in sex for the first time so I know it is not an std. recently my lymph node on the left hand side of my groin have become swollen but this only lasted for about 3 days before the swelling went down. I have read on the internet that Lymph nodes are associated with penis cancer but I'm not sure if that is only if they remain swollen. Anyway, hopefully you can tell me it's something besides cancer because I'm only 18 and I really don't want to loose my penis. Thanks for your help and input I'm looking/not looking forward to your response aha...