I dont know what this could be. If it is snow related or something, bring him and another goat in your garage in a dog kennel or something at night for a day or two. Also put a thick layer of vaseline on the area.
I have yet to see this condition in all the years. I know there are different types of mites/mange causes... I did not know this kind and had to look it up.
I have only seen canine skin mite condition and years ago mange on a rescued horse's neck and once on a cat dropped off at farm across the street had it on it's face (the cruel things people do... see a barn and think they are being nice for kitty). Fortunately all cases were not people transmittable.
Is this transmittable to humans. Couldn't find an answer to that question. I do know that it usually requires two treatments of environment at the end of the life cycle of whatever parasite.
Mane and Tail PROTECT (anti-fungal, anti-micro-organism, anti-bacterial) as a non-harsh shampoo that is so much less expensive than a prescription that does the same thing safe for most animals (found in equine area). I know works on canine's when they over-produce the good mites on their skin. Might work for this type. Just a possible cost efficient non-toxic resolution.
BTW Southern by choice... we have raised American bred GSD for almost 50 years - now in 3rd generation there also. Love them. Though not "breed racial" and would love any pet have a furever or forever home if I can help.
Went out Mon and cleaned out all of their bedding, sprayed down walls and floor with permethrin. Also cleaned up his leg and checked if he had anywhere else, and also sprayed him down. Hopefully it will work, I should know in a few days. Thank you for the help! Will give updates as the next few weeks go by.