I've had it for as long as I can remember! I'm 15 years old. Its painless, (even if I squeeze it) and I recently started to wonder If it could be testicular cancer.... It's located on the upper left testicle. I never really tried moving it around, and it's a little bigger than a pea. My great great grandpa had anus cancer, but other than that, there is no family history of cancer. Also Its only on the left, not the right. Thanks SO MUCH to anyone who answers this!!