What should you do when you have a blister on the inside of your lip?

are you sure it is a blister but if it is No one knows what causes these small, painful blisters inside your mouth. Triggers include hypersensitivity, infection, hormones, stress, and not getting enough of some vitamins. Also called aphthous ulcers, canker sores can show up on the tongue, cheek, even your gums. They usually last a week or two.

the answer is b its not mature