Mucous gland cysts are common diseases of the oral mucosa and are superficial cysts formed by retention of secretion following obstruction of the ducts of the minor salivary glands. Salivary gland cysts can occur in the three pairs of major salivary glands and all minor salivary glands, there are two types of cysts: retention cysts and congenital cysts, retention cysts are the most common, which often occur in the sublingual glands and minor salivary glands, followed by parotid glands, submandibular gland cysts are very rare, and are due to the narrowing of the ducts or obstruction of ducts due to tumors, dental calculus, injuries, and parasites, etc., which is an intermittent obstruction in which in the absence of inflammation, the ducts of the proximal glandular follicles dilate, forming a retention cyst. Congenital cysts are most commonly found in the parotid gland and develop as a result of epithelial components left in the deeper tissues during embryonic development.Retention cysts occurring in the minor salivary glands are known as mucous gland cysts, while those occurring in the remaining salivary glands are named according to the site of their origin, i.e., cysts of the sublingual glands, submandibular gland cysts, and parotid gland cysts. The exact etiology of benign hypertrophy of salivary glands is still unclear, and its possible causes include: 1, endocrine disorders: most common in diabetes mellitus, obesity, etc.; can also be seen in thyroid disease, gonadal skill disorders, hormonal changes in the stage such as puberty and menstruation. 2, malnutrition: vitamin and protein deficiency, alcoholism or cirrhosis of the liver, etc.; 3, vegetative nervous system dysfunction: is a more common cause, part of which is a central dysfunction, such as psychological factors and some psychiatric drugs caused by the other part of the peripheral dysfunction, such as some anti-hypertensive drugs can destroy the peripheral sympathetic fibers, affecting the synthesis of protein in the follicular cells and secretion.