Gums swollen a bag soft, consider the emergence of gingival fistula or periodontal abscess. 1. Gingival fistula: generally due to pulpitis is not timely treatment, leading to further development of inflammation to reach the apical part of the tooth, the emergence of periapical periodontitis, periapical periodontitis is not timely treatment, so that the inflammation invades the mucosa of the gums, through the gums to the outward discharge of pus, and the formation of a gingival fistula. 2. periodontal abscess: periodontal abscess oral hygiene is generally poor, plaque accumulation, there may be deep periodontal pockets, so that the gums swollen bag. Gums should not be blindly treated on their own, so as not to cause infection, etc.; it is best to go to the hospital in a timely manner, after a professional physician’s examination, a clear cause of the timely treatment, conducive to the recovery of the condition.