Hi, I'm 16 years of age and maybe a month ago i started getting discomfort in my groin. after a day it got a little worse and after few day the discomfort went away. As I'm typing this there is still a painless marble sized soft lump on top of my right testicle. It doesn't hurt but it can give me a funny feeling. Now and then I'd get some weird feeling down there but nothing too bad like pain. Since it's on top i think it's something to do with my epididymis. But also there's always a scare of cancer so I wanted to ask about any info. Does is sound serious?