If you think your dog has mange, I would recommend taking a look at this article that covers what mange is, what it looks like and what else it may be as well as recommended treatments:

https://www.vetbabble.com/dogs/questions-dogs/does-my-dog-have-mange/

As it says, mange is a zoonotic disease so can spread to people.  If your dog truly does have mange, be sure to get him to a vet straight away so he can be treated effectively.