Gum mass has been ten months has not completely subsided may be related to periodontal abscess, periapical periodontitis, wisdom tooth pericoronitis and other reasons, the general use of medication, serious cases can be surgical incision and drainage or tooth extraction. 1. Periodontal abscess: when caused by periodontal abscess, you can incise the gum mass to drain, rinse the affected area with saline and hydrogen peroxide alternately, and take ceftazidime, metronidazole and other antibiotics as prescribed by the doctor. 2. Periapical periodontitis: When periapical periodontitis is caused, root canal treatment can be carried out in the affected area, and the gum mass will soon subside. 3. Wisdom tooth pericoronitis: When wisdom tooth pericoronitis, local rinsing and medication, pus formation can be surgically incised and drained to promote the lumps to subside. Repeated lumps, it is recommended to remove the wisdom teeth after the elimination of inflammation. Gum mass has been ten months has not completely subsided should go to the regular hospital stomatology consultation, by the doctor after examination to determine the specific treatment plan, follow the doctor’s instructions for medication.