Care Credit is a no interest credit card that you can use for many medical bills including veterinary, dentist, doctors, etc. I use mine all the time and take months to pay it off. You can use that to pay the vet and get your cat the help it needs.
Do you or any family members have any areas that are red and/or itchy? Ringworm is very common in cats. Family members can get it from handling the cat. I've had it from my cat. It's not a big deal and cleared up with an anti fungal but you really need someone knowledgeable to diagnose the...