Cure Horse skin allergy

Cure Horse skin allergy

Amber the beautiful quarter horse​ mare was afflicted with this skin disorder around the time she was weaning her foal.
It was difficult to recognise the extent of the malady when she had her full heavy coat but more than obvious after clipping.
It took almost 4 months to clean up, cured? well will have to see if it returns
What was the disorder? still dont know even after skin biopsy and several vet exams.