Could they be cold sores?
I go for regular cleaning and checkups, but these small blisters come and go perioddically. once they are poppped they seem to stay a way for a few days and then 1 or 2 reoccur. There is no pain associated and it never seems to get worse.The blisters are right on top of my gums behind my back teeth only on the bottom and towards the inside towards my tongue.not both sides at once either.they are only about the size of a pinhead but I can feel them with my tongue when they appear.There is never more than 1 or 2 at a time.
When was your last dental checkup?
Is there any pain or swelling in the area? Does it worsen or get better with anything? Is the blisters on the gums facing the cheek or along the tongue/palate area? How long has it been going on for?