I think I've figured out what's causing his acne!! He ALWAYS rests his head on the tree when he's sleeping in it...many times daily! Look:


The kitty acne is exactly where his chin rests on the tree.

Hmmm...we clean the cat trees with a good fur scraping, water and then a good vacume monthly. I'm wondering if we need to throw that one away and get a new one?? It IS two years old.