welcome to bodybuilding and all its hang ups Richard, difference in opposing muscle size is as gaz said you tend to have more strength on one side than the other if its not a massive difference dont worry about it as the more size you put on the more it will become less visible. Due to not having a thumb on my right hand and other hand disabilities from birth my right bicep has not developed the same as my left it's about inch and a quarter smaller it will never match my left so somethings have to be put up with, this site will have most of the answers somewhere to most of your questiions and if it doesn't there's always someone who does  welcome to the forum and stick with the bodybuilding  |