question on the muscles in the forearm

[lemur]

Ok.. my forearms are starting to look quite retarted from the side because my right is almost an inch thicker than my left (only from the side though..) I assume this is from fencing although I couldn't figure out why because I train my extensors and flexors fine. I want to bring up the imbalance because people are starting to comment on it.

I asked my mom and she says it could be the pronator teres, but she isn't sure. Any ideas on how to bring up this imbalance, or what muscle group it could be?

 

[The Shadow]

do only dumbell work for all gripping and flexor and extensor exercises