Half-centimeter swelling 2cm from ear, after toothache?

I have gone to the dentist emergency today because of toothache. One tooth has been emptied apparently and filled with temporary plaster… and it will take some 3 more sessions just to get this tooth straight. I will need to desensitize the nerve or whatever it’s called.

The thing now is that I have pain from more teeth, and the pain even goes down to the jaw and up to the ear. And next to the ear I now have a 1cm or half cm swelling… a little round thing that pulsates, I feel blood passing there.

I don’t know if I always had this artifact near my ear… I don’t think so. What I know is that pain is concentrating there. As is in my throat ganglia…

May this be an infection? Abscess? Worth rushing to the ER to avoid losing my hearing?