Hi, I m Randy, I m 27 years old, 5 9 - 5 10 and weigh 160 pounds...I have no medical history other than depression and anxiety ...anyhow, a few days, I ve noticed that I have this strange, puffy painless lump directly under the head of my penis. It s more on the right side on the underside of my shaft...It must have healed because I ve went to the doctor to get it checked out, to see if I had penile cancer or something and we didn t noticed anything -- I had to point out where it was, it must have turned more skin color and got a lot smaller over night. So I have decided to test the waters and do it again, and the lump returned, just to shrink and return back to skin color. And I told my doctor all this and he told me it was not cancer and relax. So, I am trying to understand if the swelling is related to me doing it too much, I mean more than 2 or 3 times a day over a period of time I mean -- nothing else is wrong, no blockage, no pain, no dischrage, no blood -- no nothing and I do the hand practice with my right hand, and the lump in question is on the right side of my penis...coould it be due to me going beyond my physical limitations?