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I am sorry to hear July has cat acne. My name is Rebecca. I am a veterinarian and will do my best to help.
There are several things to try, that I have had success with. Every case is different; what works for one cat may not help another.
You can get Hibiclens at any drug store, and use it to gently clean the chin using a cotton ball or gauze square. Do this twice daily.
You can get benzoyl peroxide gel and apply a small amount to the chin twice daily. It is an acne product you can get over the counter.
I also like Douxo products for chin acne: http://www.douxo.us/dermatology/douxo-dermatology-dogs-pyodermia-pads.html
These you would have to order online.
I also like mupirocin ointment, but this is only available by prescription from your veterinarian if these over the counter products do not work.
Let me know if this helps and what other questions you have.
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