Although impossible to diagnosis with such a limited amount of information, this lesion is almost certainly a traumatic fibroma.
This growth is on the inside cheek and the patient reports that it has been present for decades. She was seen in my Palm Harbor Dentist office in April of 2015. Her primary concern was not this growth, but a full dental examination should include inspection of all oral tissue, both hard and soft. Many times the patient reports biting the cheek at some point in the past and the swelling never going away after the initial trauma. This is the most common location for this type of growth. I have seen and excised many of these in my almost 30 years of practicing dentistry in the Tampa Bay area. It is a benign lesion and rarely returns after excision.
Paul L. Caputo, DDS3490 E Lake Rd S Suite A