1. Seems you are suffering from a condition called Pectus carinatum
. It usually occurs / becomes prominent during growth spurt occuring during adolescence
2. Eventhough most of the causes are genetic, the deficiency of Vit.D / Calcium / Phosphate imbalance in body (Rickets) can also cause,
3. Apart from cosmetic complication, the condition usually leads to deformity
in spine (kypho-scoliosis
) and cardio-pulmonary complications
4. Its better you get a Cardio-thoracic surgeon's consultation and proceed with the treatment.