The steps of the drilling and drainage procedure are as follows: 1. incision, centered on the pressure point on the bone or the most obvious site of local swelling, incision of the skin, subcutaneous tissue, and deep fascia to expose the focal part of the bone, which is seen as a congested and elevated periosteum with increased tension. 2. subperiosteal abscess incision and drainage, puncture with an 18-gauge injection needle at the site of the protruding subperiosteal abscess, aspirate the pus, and do bacterial culture and drug 3, Bone drilling and windowing. 4, Rubber tube continuous closed drainage irrigation.