A 14-year-old female presented with a medical history of lesion in the right maxilla and loss of keratinized tissue, with gingival erythema around tooth #7. The patient’s periapical radiograph and biopsy image are attached. What is the most likely diagnosis?

*This case is from the Editorial team of Docplexus Editorial and is meant for educative purposes only. Source: UW School of Dentistry  (The answer is posted in the comment section.)