Does anyone know what to do for a nasty rash? Cat has one and we're freaking out?

Take him to a vet. Maybe not the answer you wanted to hear, but vets are professionals who can diagnose based on physical contact, not a few words on the Internet. It could be any number of causes.

Unusual. Are you sure it is not fleas or some other insect bites?

Take him to the vet or try cortisone cream from the pharmacy at .5%. Apply it twice a day to help clear up the rash.

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