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Hello, this is Dr. Jess. I am sorry to hear about your predicament! My first suspicion given your description for these kitties and the fact that they are outdoor strays would be Ringworm. Ringworm is actually a fungal infection that is contagious and cats can be infected from spores in the environment, so it is common in outdoor cats. The only way to tell for sure is to use either a special light called a Woods lamp to check for fluorescence of the skin, or to do a fungal culture of hairs plucked around the area. Here is an article with information on the disease: http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=559
The trouble is going to be the fact that if the cats are too wild to catch to bring in for an exam, I am not sure how you are going to be able to treat them. Treatment usually involves either oral antifungal medication or medicated shampooing several times a week. Occasionally in animals with just one or two spots, a topical miconazole creme used twice daily may help, but often if they have more than one spot, this will not be adequate. Also know this can be contagoius to people and other pets (if it is indeed what they have, so be sure to wear gloves or wash your hands well after touching them!
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Yes, we can see ringworm on the nose (kitty sniffing around in dirt gets spores on nose) and it can create raised granulomatous lesions, so this is definitely possible.