Not cancer, the dreaded stomatitis. We've had a couple of cats with it.
The bad spot where the molar was gone and the cheek was hamburger from the tartar, had a polyp and he took care of that during the surgery.
So, she's good and doing better. Sleeping a lot. But this morning she ate chunks of tuna, not the crumbled up flakes.
I don't doubt she'll start putting on weight soon. A good thing at her age,.