Vitiligo has a strong autoimmune component exacerbated by....insulin. Drop insulin levels and the progression will cease. Some folks have noted a recovery of the normal pigmentation with time, others not. There tends to be a high prevalence of Raynauds (a vascular condition that occurs when going from hot to cold environments ).
Search under "vitiligo and insulin/hyperinsulinism".
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."