A reactive focal gingival overgrowth derived from cells of the periodontal ligament. It is characterized by a painless, haemorrhagic, and often lobulated mass of gingiva or alveolar mucosa usually 1–2cm in size, which may have large areas of surface ulceration. Radiographically there may be scattered areas of radiopacity due to the presence of small deposits of bone, cementum, or dystrophic calcification. It is most common in young adults but may occur at any age, particularly in the presence of poor oral hygiene or local irritation. Treatment is by surgical excision with diligent root planing of the adjacent teeth to avoid recurrence.