Blister in upper lip

A blister on the inner upper lip is often irritation or a fluid-filled lesion, but persistent, recurrent, or severe sores need examination.

The upper lip contains movable mucosa, minor salivary glands, blood vessels, and sensory nerves. A clear swelling may follow friction or trauma, while a shallow painful ulcer or clustered lesion has a different clinical pattern.

Avoid biting or rubbing the area and choose cool, soft foods while it heals. Do not pop, cut, or burn the lesion, and rinse gently with water after meals to keep the surface clean.

Arrange an examination if the sore lasts beyond a short healing period, returns often, grows, or prevents eating. Seek prompt care for facial swelling, fever, spreading redness, or trouble swallowing or breathing.

Ask whether the lesion is traumatic, ulcerative, infectious, or related to a salivary gland. Ask whether a sharp tooth or restoration is rubbing it and what signs should trigger review.