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In people who have vitiligo, does the hair turn white?

Yes, sometimes the hairs turn white as well as the skin. In vitiligo, the immune system attacks the pigment cells in the skin. Some of those pigment cells are in hair follicles and are attacked as well. White hairs don't have pigment cells, so they are unscathed by the autoimmune assault. 
Yes, the hair can turn white in areas where there is affected skin underlying the hair. The same pigment producing cells that are lost in vitiligo can be lost in the hair follicle, causing the hair to turn white, a condition sometimes referred to as poliosis.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.