What could a swelling gland under my left ear that swells off and on?

A fellow caregiver asked...

I have had recent oral surgery (4 wks) and thought it may be due to gum disease. I have been in remission for over a year now with a diagnosis of RA in hands. Take no pharma medications. On last annual physical I told my doctor my concern she felt it and had lab work...but it still worries me. Please advise. Thank YOU