3 doctors weighed in:

Water blister inside mouth after biting lip?

3 doctors weighed in
2 doctors agree

In brief: Perhaps

It could be herpes, a contact allergy to something you ate , a mechanical irritation to the mucous membranes.
It should heal by itself, or see a dentist for diagnosis.

In brief: Perhaps

It could be herpes, a contact allergy to something you ate , a mechanical irritation to the mucous membranes.
It should heal by itself, or see a dentist for diagnosis.
Dr. Simon Rosenberg
Dr. Simon Rosenberg
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