A 58-year old patient presented with a white patch on the lower surface of the tongue. Oral biopsy indicated that this lesion was absolutely harmless (candidiasis, malignancy were ruled out). What is the most likely diagnosis of this oral condition?

*This case is from Docplexus editorial team for education purpose only. Source: A Guide To Common Oral Lesions Stay connected, the answer will be posted in next 48h!