So today I discovered a small lump, maybe a milimeter or at most two in size, in the center of the joint where my middle finger joins my hand. It is not painful. I am 19, with no history of cancer in the family. I have recently been having aching pains in several areas of my body (mostly groin, chest, and adbomen), though I don't know if it's the bone or the muscles. What could this be? I didn't see any other bone-related forums, so I posted here.