Hoopref34 FYI...You posted on someone's link that is 5 years old. Maybe put this in in the "introduce yourself" section. Tell your doctors, RO, ENT, MO, about the lump. It's common to get a ball, and swelling (lymphdemia), which I call a a turkey neck, under your chin from radiation or surgery, due to the lymph fluid being rerouted from the missing lymphs or slowed from your treatments, and fluid collecting under the chin. This shoud go down in time, and there are massages, exercises that can be done to assist in Lymph drainage, but check with a professional since they have to be done in a certain direction to drain properly. Good luck.