Ian if there was a problem I am sure the ENT would have seen it when he scoped your throat. They look for lots of things other then color such as changes in tissue.
You don't want cancer. You can trust me on that one also. Now that your tests looked fine go out and enjoy your life and thank God you didn't have it.

Blessings and peace,
Barbara~

[i]"The artist, a traveler on this earth, leaves behind imperishable traces of his being." -Fran