When I took the kitties to the vet, I learned that there are two other conditions that look like feline acne. The first is ringworm. I was pleased to find that the cats did not have ringworm. Demodecosis is the other condition that mimics feline acne and this, unfortunately was the culprit. Feline acne is treatable with topical ointments but demodecosis (which is contagious among cats) is treated with a nasty lime sulfur dip that is just as painful for the owner as it is uncomfortable for the cat. It took two biopsies and a few thousand dollars to take care of the situation. Hopefully, the stray was given treatment eventually as well.