what causes gray hairs?
In: Biology
While we’re here. I (28m) have had grey hair since I was 7, it’s hereditary from both sides of my family. I also have very long hair and have noticed random strands not only go from black>grey part of the way through, but also grey>black, black>grey>black, grey>black>grey, etc. what causes the pigmentation to change like that and come back after going grey?
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