"1. A free floating lump in the scrotum, seemingly not attached to anything
2. A lump on the epidiymis or tubes coming from the testicle that kind of feels like a third testicle "
one of these two likely decribes what you have. It's likely not anything to worry about (not usually a sign of testicular cancer or anything), but it's not a bad idea to have your doctor take a look next time you see him/her just incase.