I have a small white blister on the tip of my tongue (I tried to get a picture, but I couldn’t get one where the blister was visible). I’ve had it for about 3 days now and it hasn’t show any signs of getting better. At first I thought I had cut my tongue on my permanent retainer that’s on the back of my bottom teeth, but they usually heal fast. I looked it up and it said “oral thrush”, but it’s only a tiny spot on the tip of my tongue that’s white. It’s painful and it’s now getting to where I have to sleep with that special wax you put on braces in my mouth so it won’t be irritated and eating is becoming more difficult. What is it???