Suggest Treatment For Recurring Midline Neck Mass

Hello- I am a 29 year old, 160 lb male. I have a recurring midline neck mass (removed twice) that has presented itself again. The first two times the lab work came back as benign submental neck mass. In each instance I experience a small lump in essentially the same location. Other physical symptoms include discomfort swallowing and what I would describe as tightness in the base of my tongue. It s like i can move the neck mass by flexing the tongue to the roof of my mouth. These symptoms go away after surgery but the mass has now recurred a 3rd time. It s concerning the first time around let alone 3 times. I m afraid that the surgeon was treating the mass and not the cause. Any idea what would cause this? Seems like everything I read says cancer of some sort but both previous labs and a needle aspiration have come back as benign.