A bump on the back of the gums may be caused by inflammation of the gingival papilla if the bump is located close to the gum margin. Due to gingivitis or periodontitis caused by long-term chronic inflammation of the gums, inflammatory stimulation, local tissue proliferation, the appearance of hyperplastic raised bumps. In addition, some people have long-term food impaction, food impaction into the gap between the teeth, not timely removal of clean, impaction of food will stimulate the inflammation of the gum papillae, so that the gum papillae congestion, redness and swelling in the gums appeared in the bumps. If the gums are close to the tip of the root of the tooth, the site of long-term redness, swelling, pain, inflammation of the polyp, while the teeth have a feeling of swelling and discomfort, then the tooth suffers from chronic periapical periodontitis, chronic periapical periodontitis will lead to the resorption of the alveolar bone, in the corresponding part of the gums there is a discharge of pus fistulae, and therefore there will be inflammation of the proliferation of the polyp.