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I understand that when the hair follicles produce less melanin or stop producing melanin altogether, hair becomes grey. But it seems like it is the scalp hair that becomes grey first. If follicles are producing less and less melanin, shouldn't the hair everywhere become gradually grey? Why is it that the scalp hair greys first?

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    $\begingroup$ Did you do any searching for an answer? What did you find? Please share, as per our guidelines on showing your research. Thanks. $\endgroup$ – anongoodnurse Mar 12 '17 at 2:48
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    $\begingroup$ I didn't do much research for an answer. Prior to posting the question, all I read was an article (medlineplus.gov/ency/article/004005.htm) that didn't explain it other than saying that it is usually the scalp hair that becomes grey first. Will research more. Should have researched more. Thanks. $\endgroup$ – hpc Mar 12 '17 at 3:01
  • $\begingroup$ The answer is right in the article: "Graying is largely determined by your genes." Scalp hair is genetically programmed to go grey first if a person's hair will go grey. $\endgroup$ – anongoodnurse Mar 12 '17 at 3:05
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    $\begingroup$ From my own observation, it's usually the chin & jaw that goes gray first, not the scalp. $\endgroup$ – jamesqf Mar 12 '17 at 4:17
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    $\begingroup$ @anongoodnurse "Determined by your genes" doesn't come anywhere close to providing an answer about a mechanism. Presumably the "genes" are the same in all parts of the skin. $\endgroup$ – Bryan Krause Mar 13 '17 at 21:06

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