Yes, that is, if you are referring to having 'pectus excavatum'. I have it, and was pretty self-conscience of it all my life. Hiding this 'deformity' was one of my main motivations for wanting to get bigger. Once you put on a good deal of muscle, it actually helps in a way. The 'dip' in my chest actually aided in giving me more pectoral defintion I believe, and NOBODY ever comments on it anymore, when it use to be the first thing ppl noticed when I was shirtless. One they I would suggest, though, is heavy dumbbell breathing
pullovers. I did these EVERY WORKOUT for my 1st year of lifitng, and though many feel it's psuedo-science, I feel like these expanded my chest a bit, and I saw a signicant difference in the depth of the chest indention.