Hi, I am a 26 year old male. I noticed a hard lump on the lower part of the epididymis on my left testicle (essentially this is right at the point where the epididymis connects to the testicle and is at the bottom side). About the size of a pea, it was very hard. Upon some examination I felt some pain and discomfort. It appears this pain then radiated to my left buttock and groin, then the leg. It also felt like there was some pain inside my belly on that left side. I let a couple days go by and the lump seemed to shrink, but the pain on the legs became pretty bad. Best description of this is dullness. But since I couldn t locate the lump anymore I decided to try and ejaculate just to see whether it was a clogging or not. Upon doing this the lump on the left epididymis re-appeared! What s more right at this moment it felt as though my right testicle became instantly harder. Not rock solid but definitely harder. This reappearing lump was much smaller, just as hard, but on this occasion I took care when examining so no pain. The testicle can feel a bit tender, but there are no lumps on either testicle. I also just want to add that in recent months I ve started to visit the gents more often (well 4 times a day instead of 2/3). Indeed I am very scared, as I sincerely hope this is not cancer. Can anyone please provide some explanation to this? Please accept my warmest regards and best wishes.