question: I had a crown put in back in january. ever since, I have been getting a blister on the outside of my gums just under the crowned tooth. they only last for a few days and pain comes in. The blister pops and the pain goes away until the blister comes back a week or two later. This time however, it has been more painful over the weekend than normal. I am going to call the dentist on Monday, but was wondering if there are some possible thoughts on this issue.Thanks, Robert