What Causes a Lump or Growth on the Gums?

Gingival overgrowth—often described by patients as “a lump of extra tissue” on the gums—is a relatively common clinical finding that can arise from several distinct causes. This condition, medically termed gingival hyperplasia or gingival enlargement, involves an abnormal increase in the volume of gum tissue due to cellular proliferation, edema, or fibrosis.

One of the most frequent contributors is chronic inflammatory gingivitis, typically resulting from inadequate plaque control. Accumulated dental biofilm triggers a localized immune response, leading to vascular congestion, infiltration of inflammatory cells, and subsequent tissue swelling—often appearing as soft, red, and easily bleeding enlargements, particularly around the interdental papillae.

Drug-induced gingival overgrowth is another well-documented etiology. Medications such as calcium channel blockers (e.g., nifedipine, amlodipine), anticonvulsants (e.g., phenytoin), and immunosuppressants (e.g., cyclosporine) are associated with fibroblast activation and excessive collagen deposition in the gingiva. These lesions tend to be firm, pale pink, and less prone to bleeding—commonly affecting the facial surfaces of the anterior teeth.

Less commonly, gingival enlargement may signal systemic disease. Conditions such as leukemia (particularly acute myeloid leukemia), granulomatous disorders (e.g., sarcoidosis or Crohn’s disease), or hormonal fluctuations during pregnancy or puberty can manifest with gingival swelling. In such cases, the enlargement is often generalized and may accompany other systemic signs—such as fatigue, unexplained bruising, or oral ulceration.

A thorough clinical evaluation—including detailed medication history, periodontal probing, radiographic assessment, and, when indicated, biopsy—is essential to differentiate benign reactive changes from neoplastic or systemic processes. Early diagnosis and targeted management—whether through improved oral hygiene, medication adjustment, or referral for hematologic or specialty evaluation—are critical to preserving periodontal health and identifying potentially serious underlying conditions.