Can someone give me some quality exercises to increase the size of my outer bicep? The top and inner part of my biceps are coming along at a fantastic rate but the outer side of my bicep doesn't show much growth at all - ESPECIALLY in my left arm. Is there a dumbbell exersize that can increase the size of the outer bicep and should I do extra sets (with my left arm) to try and get my left arm size up to my right?

{To be honest my left bicep is "taller" and more defined but my right bicep is a lot bigger around}

Thanks for any and all help.