White blister inside bottom lip

A pale bump inside the lower lip is often irritation or a fluid-filled cyst; its appearance and duration guide the diagnosis.

A soft, translucent or bluish swelling can be a mucocele, formed when saliva from a minor salivary gland collects after duct injury. A white sore with a red edge can instead reflect a traumatic ulcer, while a hard persistent patch needs a different assessment.

Avoid biting or popping the area, and check for a sharp tooth, filling edge, or habit that rubs the lip. Keep normal oral hygiene and choose softer foods if chewing irritates it; do not apply household chemicals to the lesion.

Book an examination if the spot persists, returns repeatedly, enlarges, bleeds, becomes firm, or interferes with eating or speaking. Seek prompt care for facial swelling, fever, difficulty swallowing, or trouble breathing.

Ask whether the lesion resembles a mucocele, ulcer, infection, or another oral-mucosal change, and whether a photograph or review is needed. Ask what local irritation should be removed and whether treatment or referral is appropriate if it does not resolve.