R.J. has re-occurring acne also, especially when he is stressed. Using a stainless steel bowl helps, but you still need to wash it after each feeding with hot soapy water. Keeping the bowl clean helps with the acne more than anything, however, I also wash his face with a warm washcloth after eating (no soap). Different things can trigger the acne in dogs, just like people. Allergies may be a culprit, but sometimes it is hormonal, sometimes it is triggered by stress, and sometimes it's simply from smooshing thier faces into a greasy food bowl. I would try changing your bowls to stainless steel (if they aren't already) and washing them after each feeding. If that doesn't help, then you can try different things on the acne itself, but with the advise of your veterinarian. I would be hesitant to use any abrasive soaps or over the counter acne medications without veterinary consult. I hope it gets better.