Mucous retention cyst
Encyclopedia
A mucous retention cyst is a cyst
Cyst
A cyst is a closed sac, having a distinct membrane and division on the nearby tissue. It may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, not a cyst. Once formed, a cyst could go away on its own or may have to be removed through surgery.- Locations :* Acne...

 caused by an obstruction of a duct, usually belonging to the parotid gland
Parotid gland
The paired parotid glands are the largest of the salivary glands. They are each found wrapped around the mandibular ramus, and secrete saliva through Stensen's ducts into the oral cavity, to facilitate mastication and swallowing and to begin the digestion of starches.-Location:The parotid glands...

 or a minor salivary gland. See also Mucocele
Mucocele
A "mucous cyst of the oral mucosa" is a clinical term that refers to two related phenomena: mucus extravasation phenomenon, and mucus retention cyst...

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