These are mucoceles probably, and are nothing to worry about. The lining of the mouth has thousands of these small moisture producing little glands and sometime some of them get backed up/clogged forming these little clear blisters. They eventually rupture and go away in a day or two.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.