Hi, My son is 7 years old and I noticed a strand of grey hair on his head. Please let me know as to how this is happening and what can I do to prevent it further.

This is a genetic process, so my initial thought was that genetics would be the likely cause. Something has probably triggered the premature graying. Some people feel that this is an errant gene, like a chimerism in your son. There are a series of vitamin deficiencies that could also cause it, including vitamin B-12, although these are found in many foods. Some disease syndromes can be associated with it as well. See DrGreene.com for more information.

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