What is a mucocele?

A mucocele is a small, fluid-filled swelling inside the mouth.

Usually caused by an injured or blocked salivary gland, mucoceles are most commonly found inside the lower lip, on the roof of the mouth, inside the cheek, and on the floor of the mouth. In some cases, a mucocele may have a slight bluish color.

While mucoceles are usually harmless and painless, they can be inconvenient and annoying, sometimes interfering with eating or speaking. If left untreated, mucoceles may develop permanent scar tissue. Shallow mucoceles may burst, while deeper mucoceles may become sore or painful.

Even though mucoceles are generally harmless, any unexplained cyst or swelling in the mouth should be examined by a dentist to rule out more serious conditions.