I'm so glad that they are healthy and won't need to be seen until next year. Sunny had feline acne too. He had the black fleck stuff on his chin. I washed it off with antibacterial soap and then used peroxide on it. I also now use stainless steel bowls for food and water. The fountain is plastic but gets cleaned weekly. I now put peroxide on his chin about every other day and so far so good.