I have no experience with this-but it is an auto immune disease, that may be genetic, but not necessarily close up in pedigree. They should not be out in the sun for much time, which is not good for a bulldog anyway. It is something very difficult to manage, and I am sorry that I have nothing encouraging for you. It will be ongoing, and probably take just trying meds that might help control it. So sorry to hear about your poor baby-and you.