It can be a type of 'Candidas.' Or even cold sores. I had little blister type sores in my mouth at one time as well when I was having my teeth worked on. I had to have some teeth pulled. I developed these tiny blisters in my mouth. I'd see a dentist if I were you if they don't go away on their own. They have to give you a medication that will take away the Candidas. If that is what it is, I don't know. :)
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