There are things that persist in the oral environment that are not dangerous. BUT having said that the rule is persistent things need to be checked out, as some of them like oral cancer are dangerous. I wouldn't find any comfort in the words of the dentist and ENT that think it is nothing, there are just too many of us here that heard that and look where we are....

The deal with the pathologist is straight forward, vital dyes, provide contrast to things which are so thin and transparent that if they were not colored you would not see them. Other dyes used on these tissues like Toludine Blue, are actually absorbed more in certain parts of a cell, like by the mitochondria in the cells that have damage to the dna than others. The biggest give away in cancerous cells is that the nucleus is larger than normal. It is so much bigger that the lowest magnification can be used to make that determination.

But you can't read answers into the comments that you have heard from them so far. Until the pathologist issues his report, these other docs are guessing as much as you are.