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Steph N can you be more specific about the location
of the bump.
The clavicle (collarbone) goes from the sternum (breast bone) to the A/C
joint (where it joins a part of the scapula or shoulderblade that "turns the corner") The A/C joint is prone to arthritis, with spurs on the joint giving the appearance of a bump or can occasionally get benign bone tumors, and can separate after trauma and "ride high" giving the appearance of a bump. Lymph nodes usually lie about half way between the joint formed by the sternum and the clavicle and the A/C (acromioclavicular) joint.
Ultrasound doesn't go through bone, so the ultrasound you are scheduled for may show lymph nodes, but wouldn't show an arthritic or separated A/C joint or a benign bone tumor. If your problem is not anywhere near the bone or the A/C joint, then it would seem to be probably involving soft tissue only and the ultrasound capable of giving an answer.
If it doesn't, imagineg which allows the delineation of bony problems (xray, CT or MRI) might provide more answers.
Just food for thought...
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