I've done a lot of research on alopecia and so far, what I've read from others that have it, it is very common for hair to grow back white. I have it too. Lots of people say that over time, the white hair should return back to its natural color. Mine has been white since October with no signs of changing back. But since I also have another autoimmune disorder in which my immune system attacks my skin cells that produce pigment, my white hair patches may never change back. Gotta love it, right?