There is a very helpful video posted by Clinuvel Pharmaceutical about Vitiligo.
Here is a brief overview about things they discuss. I highly recommend watching
the video and taking a look at their website.
20 genes have some role in development
trauma to skin
psychological trauma & stress
automimmune theory -nonsegmental
segmental -neural theory
Genetic defects of melanocytes
Involvement of proteins
role of nitric oxide
Melanocortins & alpha-MSH