Painful sore on roof of mouth. near the back this morning was the size of a pin point 8 hours later its the size of a pea. very painful! what is this?

Sore on palate: An enlarging swelling on the palate can be caused from a abscessed tooth. Your should visit your dentist for evaluation and x-ray to determine the origin of the swelling.

Abscessed tooth: It is very possible that you have an abscess. This could be from one of your molars or a wisdom tooth that is trying to erupt. You need to see a dentist as soon as possible. You can get very sick from an abscess, so do not wait.