Black spot under tongue of 5 y/o. prev biopsy of toe lesion dysplastic nevus. no fam history of melanoma. gp/ent rec biopsy after watch 2mos. ok wait more?

Definitive diagnosis: Is made by the biopsy. If the recommendation is for biopsy - do not delay. Hopefully, it is nothing. In he event it is something, you need to find out.

No: No... If your ENT recommends a repeat biopsy within a certain amount of time- follow the recommendations. Dysplastic nevus is a precancerous type lesion. Dysplasia indicates the cell architecture has morphed towards the spectrum of cancer and can definitely become a cancerous lesion. Follow all recs closely as any cancer is better treated when found early.