Hi, My 13 yr old son's chest bone is quite a bit larger on the left side. It is hard to touch, and he says there is no pain but is adamant that he does not want to see a GP. He is usually healthy and recovers quickly from colds etc. He is often very pale even though he takes multi vitamins with iron. It really is quite worrying, and I will drag him to see a doctor next week, but in the mean time can you shed any light on this? Thank you from a very concerned Mum!