My dad has a lump around the clavicle bone and he does not want to go to the doctor to get it checked out. Last time he went it was smaller and the doctor said it was nothing, but now it is really big and I want to know if it is something he should be worried about because my mother and I are very worried that it could be something bad. He used to be a bad smoker but now he stopped. I was wondering if ya'll had any idea of what it could be.