Do you also have high serum gastrin levels? Vitiligo can be caused by the stomach.

I was recently examined by a gastroentrologist for stomach problems and my serum gastrin levels were high. Gastrin stimulates hydrochloric acid when there is no acid in the stomach. Other causes can also increase the gastrin hormone. The research continues. I think you should have your gastrin hormone levels checked. I have added an article below for those who want to look.

Serum Gastrin- Vitiligo: 

https://www.sciencedirect.com/science/article/abs/pii/S0140673674904838?via%3Dihub