crusts?

My cats hair is falling out on his back. His skin is turning dark and its starting to flake, which is causing his hair to just fall out. I'm waiting to get get an vet appointment, but while I wait, I was wondering if anyone else has had a similar problem

Is your cat being treated for fleas?

He needs to see a vet as soon as possible. Why is there such a long wait for a vet appointment? What country do you live in?

it could be an allergy to fleas, it could be a reaction to a treatment or he could just be sensitive, I am sure there are other things to tho hope he is ok