Bo (he's WHITE!) gets acne badly. My vet gave me some cream called Oxxydex (that he hates) to stick on his chin. That seemed to clear it up fast. I use stainless steel bowls for dry, and flat porcelain plates, (they're actually saucers) for his canned food. I had bought some small cupped china bowls for canned food, but even that aggravated it. The flat dinnerware seems to work best, his chin doesn't come in contact with anything while he eats.

It got really bad when Hanna was a kitten, then I realized he was sneaking in and eating out of her plastic kitten food bowls!

Anyways, now that I have Bo's feeding dishes all sorted out, he hasn't had a flare up for a long time. It looks quite painful when he breaks out. Bo has a heart murmer too. He's 14 and has had it for quite a few years now, but apparently it isn't bad enough to warrant any special treatment.