Ok, can anyone give me some insight as to what might have caused one of my cats to suddenly develop cat acne? I'm sure this is what it is since it is only on the chin and sounds exactly like what my mom described that her cat was treated for previously. Both of my cats eat the same thing - Iam's dry chicken/poultry. They have been eating this food for quite a while and the only semi-recent change is that my son has taken to sprinkling some dry catnip on top of the food occasionally because he thinks they like it. I have since told him to stop doing that since I wondered if maybe this was causing the problem. Both cats use the same dishes - we found that separate ones didn't matter because they would eat out of either one so we just consolidated to one bowl for food and one for water. I have (this week) swapped our bowls out from plastic to stainless since I read this was best when dealing with acne. Ceramic or glass won't work for us because the cats eat up on a shelf so the dogs can't get their food and the dishes fall off occasionally. I just want to know why Livvy got this all of the sudden. If I can't get it under control in the next few days, I will take her to the vet. So far, I am cleaning her chin with dilute hydrogen peroxide on a cotton pad twice a day and putting some antibiotic ointment on the acne. It seems a little better, but I was wondering if I need to change her food as well since I don't know what the trigger was. Any recommendations? It would need to be something that both cats will eat since they are grazers and like to take turns visiting the food dish throughout the day. It would also need to be food that I can find at a normal pet store like petsmart or at wal mart.