Red patches on both sides of the tongue.

I have noticed a small patch which is red color on both sides of the tongue. It's near the area to the back molars, which is the end of the tongue. I noticed this ten months ago and still having this. It's the same size and to describe how it looks, it looks like the skin of the tongue is peeled and look like patches. It's red in color on both the sides. It burns sometimes. So I avoid hot foods completely. It's been the same since March 2023. I saw a dentist last year for this, but he said it will be back to normal soon. I saw him on March 2023. Didn't prescribe any medicines to me. It's the same patches until now and painful at times. Does it look cancerous? I am scared and getting anxious about it. I tried to take a picture and attached it. Didn't look clear on the picture as it's so further back side of the tongue. Do I need to ask for any biopsy? Is it normal to have patches like this for almost an year? I do have mouth guard to use at night. How to make this patch go away.