A small bag inside the gums and pain may be caused by periodontal abscess, apical periodontitis and other diseases, the treatment modalities are local irrigation and drainage of pus, as well as incision and drainage after root canal treatment, as follows. 1. Periodontal abscess: In the early stage when the abscess has not yet formed, large pieces of tartar can be gently removed and the periodontal pockets can be flushed, when the pus is formed, the pus can be drained from the pockets or the gums can be cut open to drain the pus. 2. Apical periodontitis: Gum tissue is incised under local anesthesia to drain the pus, which helps to reduce pain and relieve inflammation. Pulp opening can be done at the same time as incision and drainage of pus, or the pulp can be opened first and then incised after the abscess has matured. This is followed by a complete root canal to completely control the inflammation. There may be other reasons for having a small bag inside the gums and feeling pain, so it is recommended to go to the hospital and receive regular treatment as soon as possible.