Also bathing with tea tree oil shampoo from greenhawk can help
You can also use fuzzy halter protesters from greenhawk that stop the leather from rubbing you horses face. Good fly protection and mtg for the hair loss can help also
Is it a rash caused by fly irritarion? Try putting fly remedies in his food/drink and spray him down with bug repellent often.
Yes look into eqyss shampoo and microtek spray. Give him bath with eqyss shampoo 2x a week and spray microtek every day where he's itchy works like magic!!