An Unusual Cause of Swelling in the Maxillary Labial Vestibule and Its Diagnostic Dilemma.

The chief complaint of an eight-year-old girl was swelling in the maxillary labial vestibule that had started three months earlier. A periapical lesion was suspected based on the history and clinical characteristics of the involved area. However, there was no history of dental trauma, dental caries, restorations, or any other developmental dental alteration. The radiographic findings were suggestive of a cyst of non-odontogenic origin. The lesion was excised under local anesthesia using a 980-nm diode laser with a surgical E4-4mm tip at 1.8 watts on continuous contact mode. The histopathological examination confirmed it to be a dermoid cyst. The patient has been asymptomatic without any recurrence for 18 months.