Abstract
A mucous cyst (mucocele, mucous retention cyst, ranula, epulis) is a painless, thin sac on the inner surface of the lips. It contains clear fluid. They are painless but can be bothersome. The cysts are thought to be caused because of sucking of the lip membranes between the teeth. Mucous cysts are common and harmless. However, if left untreated, they can organize and form a permanent bump on the inner surface of the lip. They are called ranula when on the floor of the mouth, and epulis when on the gums. The sac may be formed around the jewellery (piercings) that have been inserted into the lips or tongue. This article highlights the use of lasers in the treatment of excision of mucocele.
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