[benoror]

Wondering how is this related to vitiligo [a condition in which the pigment is lost from areas of the skin, causing whitish patches, often with no clear cause.]

[koheripbal]

That might be related to PABA.... https://en.wikipedia.org/wiki/4-Aminobenzoic_acid, which is also associated with premature grey hair.

Since PABA is produced in the digestive system, it's possible that stress impacts eating/digestion in some negative way?