I noticed it about a month ago, when feeling my clavicle, but on my left collarbone about a centremetre from the end of it is a very irregularly shaped hard immovable lump, you cannot notice it from looking in the mirror however it is very prominent when running your finger along, it is very small but i just cant find an explanation. I had general blood tests ran for different reasons a few weeks ago (after discovering the strange lump) and i came back with a healthy blood sample, not sure if it would detect something like a bone tumor. I don't want to go to the doctors because they think i have medical anxiety due to the amount of times i have called them up about various things. (18 yr old male)