Whether or not children need to remove their underwear for surgery needs to be determined by the site of the surgery. Whether or not you need to remove your underwear for surgery needs to be based on the site of the surgery. This is because sterilization is required during surgery and there are certain rules about the extent of sterilization. Sterilization of the skin in the surgical area needs to include 15cm around the surgical incision. Some of the surgeries that require the removal of underwear are: colon surgery, rectal surgery, perineal surgery, groin area surgery, and lower extremity surgery. In addition to the need for asepsis, some surgeries require urinary catheterization due to the long duration of the procedure. In this case, although it is possible to satisfy the scope of sterilization without removing the underpants, it is necessary to remove the underpants and sterilize the catheter in order to avoid infections associated with the catheterization. Surgeries that do not require removal of underpants: some short surgeries do not require insertion of a urinary catheter, and there are also some surgeries that can be sterilized without removing underpants, such as: cranial surgery, thyroid surgery, eye surgery, ear, nose, throat, head and neck surgery, and epigastric surgery.