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I have a bump that has grown on the left side just below my collarbone, about 1cmx1cm in size. It is very hard, painful, and not movable.

An evaluation by a medical professional is necessary to determine the cause of the bump. It could possibly be a cyst. The doctor will be able to provide more information after assessing the bump and recommend the next steps. In the meantime, you can take Tylenol if needed to help with the pain.