Hello- Laying with my 4yr old daughter last night I felt a lump. It is located about two inches from her left nipple more towards under her arm. It is between her ribs in the costal cartiledge area and moves a little, it feels like it is a little over a pea size but almost feels like I cannot feel all of it because there more depth to it. It does not cause her any pain and not tender to touch, skin color is normal in the area. It feels more like a cyst but does it still warrant a doctor s visit to be sure? I do not want it to cause issues within her ribs. Thanks, Kristen