The routine preoperative blood tests that need to be done before sebaceous cyst or epidermoid cyst excision are routine blood tests, five coagulation tests, preoperative related infectious diseases called preoperative quadruple or preoperative quintuple, and infectious diseases including antibody tests for syphilis, AIDS, hepatitis B and C. For older patients and patients with special diseases, an electrocardiogram is required. In addition to the examination before surgery, sebaceous cysts and epidermal cysts in the hair area, cysts on the scalp or vulva need to be prepared one day before surgery, which means scraping the hair and scraping the hair within 1-2 cm of the surgery site to ensure the smooth operation.