Mucous gland cysts are common diseases of the oral mucosa and are superficial cysts formed by the retention of secretion after obstruction of the ducts of the minor salivary glands. Mainly due to minor trauma to make salivary large salivary gland cysts (sublingual gland, submandibular gland and parotid gland) for the onset of swelling, there can be symptoms of obstruction (i.e., swelling increases when eating and gradually relieves after eating), the mouth of the salivary gland ducts can not squeeze out the secretion, or discharge discolored and tasteless liquid. Puncture may extract a thick white fluid. The clinical diagnosis includes: 1. There are recurrent episodes of small, clear vesicular swelling under the oral mucosa, with the contents of the vesicles being a viscous egg-white fluid; there is a history of local bites. History of clear colorless mucus flowing after rupture. The first-time patient may not have this history. 2, most commonly found in the lower lip, tongue, sublingual and buccal mucosa, a light blue soft-like mass, clear boundaries, the base can move, sometimes protrude from the surface in the shape of a fish bubble, generally about 0.5-1cm in diameter. 3, large salivary gland cyst: for the onset of the site in the oral and maxillofacial corresponding large salivary gland site, manifested as the site of the swelling and obstruction symptoms, duct mouth secretion function abnormal. Sublingual gland cyst puncture extracted egg white thick fluid; submaxillary gland and parotid gland cyst puncture extracted thin fluid; extracted fluid amylase test was positive. 4, pathological diagnosis was confirmed.