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Mucous cyst   

Overview | Symptoms | Treatment | Prevention

Alternative names:

Mucocele; Mucous retention cyst; Ranula (when on the floor of the mouth); Epulis (when on the gums)

Definition:

A painless, bluish, transparent structure consisting of clear fluid trapped beneath a thin layer of mucous membrane.

Causes and Risks

Mucous cysts are common on the inner surface of the lips and appear as a semitransparent fluid-filled blister. They are painless but bothersome because people are so aware of irregularities in the mouth. The cysts are thought to be caused by sucking action drawing the mucous membranes between the teeth. Mucous cysts are harmless. If left untreated, however, they can organize and form a permanent bump on the inner surface of the lip.

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