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So sorry you are having this swelling!
This is what I would recommend: I would go see your Dentist of choice for a brief x-ray and to let him or her get a good visual of the swollen area. Because the x-ray will quickly tell if abscess is occurring or not!
My guess (And I hope I'm wrong), is that it could very possibly be an abscess from one of your front teeth, perhaps one of the crowned front 4 teeth. If it is; don't be overly concerned though, it can easily be fixed, and won't in any way ruin your crown/s, but I'd suggest you try to get into your Dentist fairly quickly - if at all possible. Does this make sense?
I understand... I was merely responding to your question.
Hopefully, all will be well until you return, at which I time I'd strongly recommend you see your Dentist for an x-ray and visual exam - OK? Swish a few times a day, may help a tid-bit. And keep up the good oral hygiene ( -:
How is the swollen area doing?