Hello - Since having three crowns on my lower front teeth, I have been getting two light in yellow color pus filled blisters on my gum line, directly below the crowns. I did not have these before. I pop them and they return. I am pretty sure this means an infection of some sort and I need to go to the doctor. I am not running a fever. Admittedly, my crowns were EXTREMELY sensitive at first - to the point I could not chew with them. this lasted a few months. They still get a little sensitive but I am able to use them better this last month plus or so. I still cannot use them as "tools" - for example, pulling off foil from the top of a lid. Thank you in advance.