Yes, I've heard of it. It's called feline acne. My Sunny has a bad case of it right now and all of my cats eat out of stainless steel bowls. I wash them after every meal with hot water and antibacterial soap. Storm also has a mild case. I've been washing their chins with antibacterial soap and applying a hot compress to it. It keeps coming back though.
Pearl had a bad case a few weeks ago and she had 3 whiteheads on her lower lip. I applied a hot compress to it a few times and everything cleared up. Sunny has always had the black spec kind and his comes and goes. I think it might also be stress related because he stresses very easily. He's going to the vet this Saturday for his annual exam so I'm going to ask the vet what he recommends for his acne.
Here's a link about feline acne: feline acne.
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