I have seen many boys under the age of 19 years that some of their hairs get white out of black hair which looks too odd. I want to know the reason behind this that why some hairs gets white.

Dr. Sajeev KumarGeneral Physician32yrs exp

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They are having premature greying. The premature graying problem is largely genetic. Hair follicles contain pigment cells that produce melanin, which gives your tresses their color. When your body stops generating melanin, hair presents itself as gray, white, or silver.Premature graying has been associated with certain medical conditions such as thyroid disorders, vitiligo, vitamin B12 deficiency, and anemia. Vitiligo is an autoimmune condition in which the cells that make pigment (melanocytes) are destroyed, resulting in patches of hair and skin that become white 

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