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This is Dr. Bonilla, experienced in Internal Medicine, Pulmonary and Critical Care.
I understand your concerns. A movable lump on the neck could be secondary to different conditions including, sarcoidosis, acute viral/bacterial infection, infectious lymphadenopathy, hodgkin lymphoma, non-hodking's lymphoma, autoimmune disease, drug reaction. At his age an infectious etiology causing lymphadenopathy is likely. Let me know if you have any other questions. Thanks
The same apply for the anterior neck, besides what I mentioned a thymoma, parotitis, goiter, thyroiditis, thyro glossal duct cyst, cat-scratch disease and cervical rib can also cause this problem.