Thanks for your question on Healthcare Magic.
I can understand your concern.
Yes, that indentation on chest wall can be due to
pectus excavatum.
It is actually developmental defect of
rib cage.
Most common cause for this is calcium and
vitamin D3 deficiency.
So get done calcium and vitamin D3 levels and if deficiency then you may need supplements.
Actually surgery is very difficult in such cases.
Surgery is indicated only If you have any symptoms like
cough, breathlessness, recurrent
chest infection etc.
If you are not having any of these symptoms then no surgery is needed.
Exercise or muscle strengthening will not be helpful in this.
Better to consult orthopedic doctor and discuss all these.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.