Blister on bottom lip

A blister on the inner lower lip is often a fluid-filled irritation or a mucocele, but trauma, an ulcer, or infection can look similar.

A mucocele forms when a minor salivary gland duct leaks after lip biting or impact; an ulcer is an open sore rather than an intact blister.

The clinical question is whether the symptom fits the named product, treatment, or injury, or whether another dental condition explains it.

The exact cause depends on the tissue involved, the timing of symptoms, and whether there is visible damage or inflammation.

Do not pop it. Avoid biting the area, choose softer foods, rinse gently with salt water, and protect the lip while it heals.

Use only measures suited to the tissue and stop any step that causes sharp pain, chemical burning, or worsening swelling.

See a dentist or clinician if it lasts beyond two weeks, repeatedly returns, enlarges, bleeds, becomes very painful, or is associated with swelling or fever.

Prompt assessment matters when symptoms affect eating, sleep, breathing, swallowing, or normal tooth function.

Should I puncture a lower-lip blister?

Ask what was examined, which finding explains the symptom, what treatment is indicated, and what change should trigger an earlier review.