2 doctors weighed in:

Why does blister form on my lips? Is this due to bad mouth health?

2 doctors weighed in
Dr. David Schleimer
Dentistry - Orthodontics

In brief: Likely Herpes

Lip blisters that cannot be related to burns, exposure or trauma are more than likely herpes simplex virus, and oral hygiene could be a trigger, but not the specific origin.

In brief: Likely Herpes

Lip blisters that cannot be related to burns, exposure or trauma are more than likely herpes simplex virus, and oral hygiene could be a trigger, but not the specific origin.
Dr. David Schleimer
Dr. David Schleimer
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Dr. Cynthia Point
Internal Medicine

In brief: Could be a cold sore

Cold sores cause blisters to form on the edge of the lip.
They can return from time to time in the same place or nearby. If you haven't had these for years off and on, check with your dentist, and maybe an ear, nose, and throat doctor. Sometimes toothpaste can cause an allergic reaction, so if the blisters are wide spread, try to change toothpastes.

In brief: Could be a cold sore

Cold sores cause blisters to form on the edge of the lip.
They can return from time to time in the same place or nearby. If you haven't had these for years off and on, check with your dentist, and maybe an ear, nose, and throat doctor. Sometimes toothpaste can cause an allergic reaction, so if the blisters are wide spread, try to change toothpastes.
Dr. Cynthia Point
Dr. Cynthia Point
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