I have problems with swelling due to hypothyroid. I haven't heard of having swelling under the ears, but I have it in my face and in my neck if I am not in balance. Magnesium is also good for swelling and hypo.
Does it go down into your neck?
Did you go and see your primary dr first?? It might be lymph nodes swollen, for starters. I would start at square one with your primary.