Our Taz had it once when she was young (over 10 years ago) and all of a sudden she's had 2 seriously nasty outbreaks in the last 2 months. I didn't believe the vet at first because it was so much more severe than I'd ever seen it- big hard lumps in her chin- but it does have the black flecks/dots like feline acne. I am starting to think that somehow the calicivirus our new kitten brought in made her more succeptible to the outbreaks.
We feed out of china and porcelin except for the timed feeders and have now put those away since this second outbreak. Her poor chin is going to have scars from the first one for sure and the hair is so thin. The vet gave us a salve to put on twice a day but that seemed to make the skin tough so it couldn't drain and it got worse so now I only put it on once a day and wash her chin with a warm wet washcloth a couple times a day. I feel so bad, last night when I got home from work it seem to be almost dripping blood. I am thinking about trying Neosporin on it to try to help the healing faster, it took over a month for the first one to clear up.