I realize this is a late response, but from a distance, this "neck bump"
sounds like torticollis (a muscle problem).
A broken clavicle is felt somewhere between the shoulder joint and where
the neck starts. The ones I've felt are sort of like feeling gravel or
something "discontinuous" under the skin. I'll bet that very slight
fractures are more difficult to detect.
As the bone heals a "callus" will form - that's when you feel a "bump" under
the skin.
Gail Hertz, MD, IBCLC
Hershey, PA
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