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Oral mucocele is a condition caused by two related phenomena - mucus extravasation phenomenon and mucous retention cyst.
Mucous extravasation phenomenon is a swelling of connective tissue consisting of a collection of fluid called mucus. This occurs because of a ruptured salivary gland duct usually caused by local trauma in the case of mucous extravasation phenomenon and an obstructed or ruptured salivary duct in the case of a mucus retention cyst. The mucocele has a bluish, translucent color, and is more commonly found in children and young adults.
Although these lesions are often called cysts, mucoceles are not true cysts because they have no epithelial lining. Rather, they are polyps.
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