It is normal for a guy to have one testicle larger than the other. It's normally the left one. Is that the case with you? As for the pain, I dont know... I suppose balls are supposed to be lumpy, but if it actually causes you pain you might want to have it checked out. Doctors have seen everything!! But the size thing is nothing to worry about

I have something 'attached' the back of my right ball too, where the epididymus is, but it feels like its bigger and more noticable than the epididymus on my other ball.. Kinda aches a little too. Any ideas?