The presence of pus under the bloody scab usually indicates the presence of infection in the wound. If the degree of infection is mild, local debridement and disinfection, dressing change and other treatments; if the degree of infection is more serious, pus drainage or surgical drainage of pus is required. In addition, it is necessary to pay attention to good daily care. 1. The degree of infection is mild: there is pus under the scab, if the degree of infection is mild, you can use saline or hydrogen peroxide to flush the wound, and then use povidone-iodine to flush the wound, after the wound is cleaned up, and then use the povidone-iodine gauze against the wound to make a wet dressing, and change the medication every day. And take amoxicillin, cefaclor and other antibiotics anti-infection treatment. 2. Heavier degree of infection: there is pus under the blood scab, if the degree of infection is heavier, and accompanied by fever, redness, swelling and pain and other uncomfortable symptoms, it is necessary to surgical incision to drain the pus and drainage of pus, and regular medication change treatment. In addition, topical polymyxin B ointment, mupirocin ointment and other anti-infection ointment should be used. Intravenous antibiotics such as cefuroxime and levofloxacin should also be used. If there is pus under the blood scab, it should be taken seriously, and timely medical treatment should be carried out by the doctor to prevent the infection from worsening.