I have 2 male indoor cats, from seperate litters, and both of them have a rash on their hide legs and a little bit on their belly. I took them to the vet and she ruled out ringworm and fleas and gave them shots for a skin infection, well its 3 weeks later, and the rash is still there. I changed their food to a hypo-allergenic venison food and I only clean my floors and counters with hot water vinegar and lemon, so I have no idea where this rash is coming from. They don't seem to be overly affected by it, still very energetic, but they do seem to be cleaning more, any ideas what this could be?