My cat KITTY had it, took her to the vet and he said some cats get it. And shrugged his shoulders. Gave her some pills and it went away.

My concern here is I don't think its known to spread. I did relize I had a problem with a dirty doggie door, in this case kitty door, from them going in and out to their pen, so now I make sure I keep it clean. But again, I don't think acne spreads. Are you positive that its acne?