Its been their for about a 1 wk. and its painful at times. Not sure but thanks for the responses.
If it wasn't painful, cleared up just as quickly, and another blister has not recurred, I doubt it was herpes. And half the world has oral herpes, so if you also do, it won't be any big deal in your life. So I suggest moving on without worry about unless and until you get repeated outbreaks. In that case, quickly see a doctor or clinic for conclusive diagnosis and testing.
It looks like one single white clear blister. It was like 2-3 days later but cant say for sure.