How to treat your kitty's acne in Dr. Jean's own words:
"You can try to treat it at home for a bit, then if it doesn't work, go to the vet for the big guns.
First, if he's eating and drinking from plastic dishes of any sort, replace them immediately with glass or ceramic. They are non-porous and don't hold bacteria like plastic does. Clean them daily. I get these little glass dishes from the grocery store during "Dollar Days." I have a bunch and rotate them. My newest favorite trick is paper plates, I'm trying that on my one that has very mild acne and it seems to be clearing up on its own.
A flat plate rather than a bowl, or a straight-sided bowl (like a ramekin or casserole dish), will help prevent the skin coming in contact with the food and sides of the bowl.
I'm not crazy about steel or aluminum, even the shiny smooth ones, because the metal can hold static and shock the cat when he goes to eat. This is a big issue around here right now because it's extremely dry and very windy--just taking a couple of steps across the floor will build up enough static to give you a nasty jolt!
I recommend twice-daily cleansing with Betadine, an antibacterial soap. Might also be labeled Povidone Iodine. Dilute the socks off it--the stuff starts out dark brown (and stains *everything*), dilute it in warm water until it is weak tea colored. Swab it on with a cotton ball or gauze pad. If it's too strong it will burn the skin.
If it's really bad and he's painful, it may be best to have your vet clean him up under anesthesia. That will give you a fresh start on your hygiene program.
Don't use Dial, hand soaps, or detergents because they leave a ton of residue and will irritate the skin. "
Best of luck!