Uneven Pecs

Hello Mike, I have an issue with uneven pecs. It may not seem bad, but it is very frustrating feeling the muscle differences. My right pecs is much more defined and more muscular on the bottom of the pec, while my left pec does not have much muscle nor definition on the bottom of it. It is like when you look at someone really ripped and see how the pecs are defined at the bottom, but not nearly as muscular. How do you think I could go about fixing this?

 -Thank you, Mike