If it was me I would be more than concerned ,as I would be in to see an ENT doctor and then a Dentist.
That is not Fibro and a blocked gland
or swollen gland
does not always affect the jaw, you have a trigmential nerve in that area, teeth, tissue and the rash is a sign something is going on.
See a Specialist (ENT) a good one, to see what is really going on right away...if it is an infection it could go to your brain. So, do not take it lightly.