We're going out of town this weekend, but I'll try to get a picture of it after we get back (assuming it hasn't disappeared).
He eats his wet food from porcelain plates that I clean each time he eats, but come to think of it, I don't wash the porcelain bowl his dry food is in very often. I'll start doing that. But he shows no awareness that it's there....there's no scratching or anything. So it at least looks like it's not bothering him.
How would you get a cat to hold still long enough to let you wipe his chin? Did you know they have teeth?