Plastic surgery: removal of extra nipple

Hello i have an extra nipple on my chest right above my normal nipple and i was wondering with the removal of these nipples how high is the chance of the skin "stretching" or "splitting" if my chest expands a little more (1 to 2inches) due to working out?

My plastic surgeon there is a chance but i think he made it sound more serious than it is because he has to get the point that he TOLD me there is a chance it could happen.

I want your guys/gals opinions on this, hopefully some insight from personal experience ! Thank you

p.s the procedure is basically cutting around the nipple and sewing the skin back together.