I have had a problem for 4 years. A sticky substance grows from my gum up over a few of my back teeth - always in the same spot. If I brush it and scrape it away as best I can, it will grow back within hours. I see a dentist and a periodontist every three months. They cannot determine what is wrong. I have had a biopsy, a skin graph and a visit to a dental surgeon. This surgeon could only suggest using a mild toothpaste - it made no difference. I am very frustrated with this situation, Any suggestion as to what it might be? Any treatment?