Eileen. Of course you are right.
Unfortunately, my Mom is a bit stubborn like many (like Mom like Son

Anyway, when it was just a white splotch and had only been observed for a couple weeks, there was no cause for alarm.
She had some new braces (Invisaline?) around September 6, and they routinely cause sores.
The "sore" (which actually isn't sore), was first noticed by my Mom in the mirror a couple days after that.
So, to be accurate, it has been about 6 or 7 weeks now and she has been back to the DDS a couple times, and this one ENT twice.
I called 2 SoCal CCC's intake dept's and both told me she would have to have a dx before making an appt.
That's where I get that perspective, but of course it could be way off.
Also, 2nd and 3rd opinions are not a bad idea when the standard of care for one's case gives 2 completely different lines of suggested treatment and the decision is so crucial.
So, if she didn't get a 2nd or 3rd opinion at this point she'd be just worrying and waiting for a December followup.