Parotid cysts generally do not turn into cancer, but there is a very small possibility that they may become cancerous. It is recommended that the relevant people receive regular treatment after timely consultation, which is usually effective and has a low recurrence rate. 1. Parotid cysts can be divided into retention cysts and congenital cysts, the former is caused by parotid trauma or inflammation, lymphatic epithelial hyperplasia of parotid ducts, resulting in ductal obstruction and accumulation of saliva to form cysts; the latter is mainly related to congenital abnormalities of embryonic development. This disease often occurs in people with low immunity, parotid inflammation, parotid gland and duct trauma. 2. The occurrence of parotid tumor is closely related to gene mutation, long-term exposure to rays, and may also be related to heredity, advanced age, smoking and other factors, but has little relationship with parotid cysts. Therefore, parotid tumors generally do not undergo malignant changes leading to cancer, but if left untreated for a long period of time, it is more likely to lead to infection and the spread of infection. Even though the possibility of parotid tumors changing is extremely small, it is still recommended that the relevant groups of people should consult the doctor in time for regular treatment and cure the cysts as soon as possible to avoid the serious consequences it may lead to.