Little blister in mouth

A small mouth blister is often caused by friction, a bite, or a viral lesion, but a persistent or recurrent lesion should be examined.

The oral mucosa can swell after biting, heat injury, a sharp tooth, an appliance, or infection; location helps distinguish these possibilities.

Do not pop it. Keep it clean, avoid hot or acidic foods, use cool fluids, and note its location, texture, and changes.

Seek care for spreading swelling, pus, fever, severe pain, trouble swallowing or breathing, or a lesion not healing within two weeks.

Ask whether the lesion is traumatic, viral, ulcerative, or tooth-related and what examination is needed if it remains.