I think it depends on how easily you can lay hands on them. Looks like mange in the first photo. We used to use Demodex in a bath to treat that. Maybe now there is an Ivermectin product for it. “Mange by mail” has a protocol for adding a specific amount (.1 to .3 ml) of injectable ivermectin to meat bait that’s supposed to cure it. No surprise that any such use is not approved in the official description.