Seeking pet care sites / lists / advice for my poor kitty

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Note: Don't read if easily grossed out.

My (male neutered 11-year old) cat has festering sores coming out of

his body. I thought it was a racoon bite. But he only goes on the

deck now, supervised, and he has a new, red, pus-oozing sore today.

It's awful.

I've been meaning to get his diet more NT like. Can anyone recommend

the equivalent of this list for Pet care?

Anyone know what might be causing these sores seemingly out of nowhere?

Thanks so much.

Daphne