Could be cold sores, canker sores or blisters.
...but its probably, (hopefully!), Fordyce's condition, which affects 50-90% of men. And which is a gigantic range for an estimate!...
It is just an infected taste bud. I would suggest the best thing to do is to not mess with it. I've heard of people trying to bite them off with their teeth, but i am not sure how that goes. Don't...