Could this be neck or jaw lymphedema? Is there such a thing? It's just worrying to me; makes me think something got missed.

Left tonsil SCC, HPV+. T2N0M0. Tonsillectomy 3-07, bilateral radiation, cisplatin 3x, Tx completed 6-06. Clear PET 4-01-2008.
Thyroidectomy 5-9-08, resulting in permanent surgically-induced hypoparathyroidism and adrenal problems. Bummer.