Hi Barb,

My Dad also developed the thing under the chin. The ENT surgeon told us it's called a Dulap and it's caused by the radiation.

He went to a plastic surgeon to inquire about having it removed; he said he could do it with a local freezing.

A few months later he had neck dissection surgery; and at his request the ENT surgeon removed it during the surgery.

Take care,
LisaB