answer me please

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do you know those unusually long hair on your skin that is not suppose to be that long compared to the others. Sometimes I see it on people's faces but I have mine on my arm. My hair is dark and this peculiar strand of hair is white and very light but never breaks. It is a kinda funny and weird thing. What I know is they are called CAT'S HAIR. Does any of you know why we (or some us) have these types of hair? Why does, when we do pull them out, grows back exactly the way they were before? Answer me please.