General Disclaimer: I'm not a vet. I have my opinions based on my personal observations, but no academic training.
In general, I think the problem with these cats is a slightly compromised immune system which allows the bacteria/fungus/virus to thrive in the skin. So, this means we need to improve the immune system by improving the diet. In my case, I feed raw food. I know a lot of people have problems with raw meat (including most vets), but I don't and neither do my cats. If you want to try it, I'll gladly help you.
Let's assume that you prefer the commercial food. Look for one that uses human-grade food, no by-products, and little or no grains, especially corn. Wellness, Innova, Halo, Mother Hubbard are okay, but not ideal. Someone mentioned Nature's Variety Grain Free food and it does look good -- no grains, mostly meat, Omega's. (I may actually buy some for emergencies, as in, when I'm too tired to make food!) You want to get the purest food for him. Also, if it doesn't upset his stomach, variety is good just so if one brand is slightly lacking in one thing, another brand might not be.
As for supplements, when Clancy had it, he got echinacea (in 3-week cycles), goldenseal, a Chinese herbal thingy called Compound A from Seven Forests, extra salmon oil (or flaxseed oil), and mixed raw glandulars. He also got one week on, and one week off of milk thistle. The whole rational was to build up the immune system and flush out the problem. He was on this for about 4 months, until I was 100% sure he was over it. He's now on just extra raw glandulars.
He did have one big flair up in the last year and that was when I fed him cheap kitty treats. He only got 2-3 a night, but in about a week the black gunk and pustules began to appear. He went back to dried salmon or chicken as treats, and he's been fine since.
Hope this helps.
Linda
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