There are a number of reasons for small testicles..estrogen levels, testosterone levels other medical conditions and a cause that has become more prevalent in today's world...............steroids. Body builders, athletes and others that use lots of steroids end up with small testicles, as to whether or not steroids could result in "a small bump" I don't know. The individual probably knows what's up down there, but it could be an awkward ask.

Hey there, I have no idea about that and I imagine all men are different, but that is thee most unusual post I think I've ever read!!

I think that's very unusual. My advice is to concentrate on the parts of anatomy that can give you pleasure. lol

That's pretty rare..

You could ask a large group of men, "everyone with small testicles, raise your hand".