Is there a way to quickly get rid of the blister in my mouth? is it better to pop it or leave it as is?

Salt water swish: It is probably a benign apthous ulcer which can be relieved by mixing one tablespoon of salt in a glass of warm water and swishing in mouth for 2 minutes and spitting out repeating 3 times a day.

Leave it be: There are several pathogenic proceses that cause oral blistering. Popping the blister can only spread the problem, get infected or generally have negative consequences. Good luck!