The degree of danger of cysts is related to a number of factors, including the nature and size of the cyst, so it is not possible to make a one-sided assessment of which cysts are the most dangerous. A cyst is a sac-like mass that grows on the surface of a person’s body or on one of the body’s organs, and its contents, usually fluid of a different nature, are a common benign lesion in the body. Cysts located in the dermis and subcutaneous tissues include epidermoid cysts, dermoid cysts, etc. Cysts located in the internal organs include liver cysts, renal cysts, ovarian cysts, and prostate cysts. Generally speaking, the chance of malignant transformation of cysts is relatively small, so physiological cysts and smaller cysts without clinical symptoms and slow growth do not need special treatment, usually pay more attention to observation, and go to the hospital on a regular basis for review. However, if the cyst suddenly increases in size and exerts pressure on the surrounding tissues, and even the affected area has pain, numbness and other symptoms, the possibility of malignant transformation of the cyst cannot be ruled out, and it is necessary to go to the hospital in time for puncture examination, and undergo surgical treatment to remove the cyst if necessary.