What is the diagnosis for a median, rounded lesion located anterior to the circumvallate papillae that shows epithelial hyperplasia?

Explanation

The lesion described is characteristic of median rhomboid glossitis, which presents as a smooth, erythematous, rhomboid-shaped patch on the midline of the dorsal tongue just in front of the circumvallate papillae. It shows epithelial hyperplasia. Other options such as geographic tongue (erythema migrans) and aphthous ulcers have different clinical features, while chemical injury results from trauma or irritants.