In reply to kieran b: I had this a couple of weeks ago after a week of tooth ache. Went to the doctor who sent me to the medical triage up at the hospital for them to have a look. They then sent me to ENT who kindly stuck a camera up me nose and down me throat. They then got the max facial docs in to have a look. X-rays and ultra sound and bloods. Then after a whole day at the hospital was told......Probably that the gland was up because of a lingering infection from the toothache......take a course of antibiotics and go see the dentist. Was told also that a gland up in the neck is normally down to a localised issue because of gravity. Dentist sorted it after finding that a filling had come away from the tooth and said "ha ha ......should have come to me first."
Do go get it looked at though