The yellowing of the wound may be due to localized plasma-like exudate, bacterial infection, etc., and the cause of the disease should be identified in a timely manner. 1. Local plasma-like exudate: the wound serum coagulation was yellow coagulum, which is a normal phenomenon. This is due to the plasma oozing out on the wound surface to form coagulation, the wound if there is no redness, swelling and pain, the local skin temperature is normal, there is no abnormal secretion, this situation is considered a normal phenomenon, do not need special treatment, give intermittent disinfection and change of medication, prevention of infection can be. 2. Bacterial infection: the wound can have yellow purulent secretion, this situation is due to pathogenic microorganisms in the wound reproduction and growth caused by local redness, swelling and pain, elevated skin temperature, pus secretion can be yellow, this situation needs to strengthen the treatment of dressing, and give amoxicillin, cefaclor and other antibiotic treatment. This symptom alone is not enough to diagnose the disease, there may be other factors. It is recommended that the patient consult a doctor to determine the cause of the disease and give targeted treatment.