A 60-year old lady presented to her dentist with complaints of some white tissue under her lower implant prosthesis. The clinical assessment revealed a white, corrugated lesion lingual to the acrylic of the fixed hybrid prosthesis. The lesion measured 5x24 mm and could not be scraped off or removed. It was not painful or symptomatic, and no swellings were noted in the sublingual or submandibular lymph node areas. What would be the most likely diagnosis for this patient?

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