A Solitary Gingival Nodule

Photo showing a slightly transparent mandibular nodular mass between the left canine and first premolar.
The following Case Challenge is provided in conjunction with the American Academy of Oral and Maxillofacial Pathology.

A 38-year-old Hispanic female presented for evaluation of a gingival nodule of eight months duration. The nodule, which was slightly painful to palpation, had increased in size over time. The patient denied any history of trauma to the area.

After you have finished reviewing the available diagnostic information, make the diagnosis.