I do get hairs that seem to have changed color (lighter to darker, or darker to lighter, or redder/less red) and back, but I don't know the cause. Perhaps someone who knows something about the physiology of hair color will chime in. I wonder if it's something as simple as some parts of my head getting more sun than others, so the hairs on those parts are more likely to lighten?
I have also found bands of grey/white, surrounded by normal color, that (assuming 1/2 inch of growth a month) correspond well to when I was very sick.
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