So a while back i discovered a lump slightly below my right clavicle, it is about 1 inch in diametre and tapers downwards to the right about 2 inches. Its not painful, and does not feel hard, but more slippery somewhat soft, with a solid centre. It is completely underneath my skin and not connected to the skin, but the bone and muscle underneath. I had it checked out by a doctor a while back, and he booked me in for an ultrasound and x-ray. In both the X-ray and ultrasound, they could not discover what it was, then soon dismissed it. Afterwards at the doctor who was assessing the ultrasound and X-ray results, he said that it may be because of arthritis in the collar bone joint, but in that case, it would be painful. I still do not know what it is after about 5 months and it has increased in size, does anyone have an idea? By the way, i am a 14 year old guy