From the photos it looks like you have a small amount of gynecomastia or possibly fat below your nipple area , both which are easily corrected with surgery. If there is a firm mass this is most likely gynecomastia. Consult a plastic surgeon for the correct diagnosis and see what options there are for your condition. In my practice you would undergo a day surgical procedure and be able to return to work in 2-3 days.
You look like you have gynecomastia, but hard to tell with just a photo. At any rate this can be resolved with surgery if you wish. See a plastic surgeon who does this type of work. Good luck.