Im 16, i recently lost a bit of weight with changing my diet and i noticed something very weird, one of my ribs has some kind of a bony lump on it and its really weird looking, when i put my arms up you can see that its a lil bigger than the size of my fist and its kinda flat,it also has lil lumps could it a part of the rib or something, not painful though, my ribs look very uneven and im really curious what could it be, ive never seen something like this before because i was overweigt, help?