There is white foreign matter in the wound more than twenty days after the surgery, which may be due to the wound scab, but it can not be ruled out due to the wound infection, and it is recommended that the patient go to the hospital for examination in time. Generally speaking, during surgery, the local skin and soft tissues will cause some damage, the postoperative wound in the healing period, there will be the phenomenon of scabs, if there is no pus oozing, generally do not need special treatment, regular observation can be. If the patient does not pay attention to keep the wound area clean after the operation, it may lead to bacterial invasion and infection, and when the bacterial secretion flows out in large quantities, the phenomenon of white foreign matter will appear in the wound. Patients who have undergone surgery for more than twenty days, when white foreign matter appears in the wound, should go to the hospital for examination in time, and under the guidance of the doctor, identify the cause of the disease and take the right treatment, do not be negligent, so as not to cause delays in the condition.