So for awhile now I have had discomfort in my left ribs cage and just recently I noticed a hard pellet size knot right below my rib cage where my mid abdominals and obliques separate. I was curious if I had one directly in the same spot on the other side and I do. I played football for many years collegiate and pro and have done my fair share of heavy lifting. 

The discomfort radiates to my back as well but stays in the rib cage area. I went to a doctor and they said it could be spleen where I was pointing. Can anyone help to give me some answers on what this might be whether it's calcium deposits or something. I don't think it's serious because I have two lined up in the exact same location almost like it's part of my anatomy. But the discomfort that I'm feeling when I press them makes me wonder. 

I also also injuried my sternum a year ago and the run pain could be due to costochonritis?

Thank you for your help!