If it is a gingival tumor, surgical removal of the tumor will be considered, otherwise it will continue to grow and even develop further lesions. If it is a fistula, which is an inflammatory condition, you need to find out which tooth it is and choose between root treatment or periodontal treatment depending on the severity. In the case of root treatment, it is often referred to as root canal treatment. If the fistula is caused by periodontal disease, periodontal treatment is required to heal the fleshy lump, which will be quickly eliminated by treating the fistula.