The most likely cause of a fleshy lump on the tooth flower is chronic periapical periodontitis. When pulpitis in a tooth is not treated promptly, the infected material in the pulp cavity spreads down the apical foramen into the alveolar bone, causing resorption of the apical alveolar bone, redness, swelling, pressure pain, hyperplastic sinus tracts, and hyperplastic inflammatory polyps at the gums. When the source of infection is removed, the inflammation within the alveolar bone will be metabolized and absorbed by the body, and the inflammatory polyp in the gums will gradually disappear. In addition, gum bumps may also be caused by gingivitis, in which case periodontal treatment, such as supragingival ultrasonic cleaning and periodontal scraping, should be performed to remove the tartar and plaque irritants around the gums, and if the gum tumors do not subside on their own, they usually need to be surgically removed.