holy pec

on my left pec on the top/side the is a kind of gap, i dont have this on the other side and you can see the hole if i flex... how do i fill this?
 
it could be possible that your were born without pectoral muscle in that area. ITs not uncommon. but it could also be that you have one arm/ shoulder that is assisting the other too much. Try using only dumb bells or cables.
 
I have the same thing - I am right handed and the right side of my body is more developed, which is a pain.

On my left pack when i tense it there is a pit just below the armpit where there is no muscle. I want to fill it out but havent figured out how yet!
 
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