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Why does human hair behave differently depending on its location? For instance, head hair grows to an indefinite length, but eyebrows maintain a particular length and appearance. Head hair and eyebrows may exhibit balding, but not ear, arm, nose, and facial hair (etc). Why is this so?

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  • $\begingroup$ The answer for why is in this post: basically because of differences in follicle cycling. Are you asking how exactly is this controlled? $\endgroup$
    – WYSIWYG
    Jan 12, 2015 at 16:54
  • $\begingroup$ Thank you for the link. And, yes, I am asking how this is controlled. $\endgroup$
    – BluWasabi
    Mar 20, 2015 at 16:14

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