My eyebrows are changing colors?

So the first day I noticed my hair changing color I noticed a few hairs turning a light brown color, but I have always had brown hair. I assumed that I had just gotten some of my liquid foundation onto my eyebrows somehow and so I just tried to wipe it away and ignore it. A few days later someone noticed it and asked me if I had penciled in my brows which I hadn't. One day when I was wearing no makeup at all I looked in the mirror and half the hairs in my eyebrows were like a goldish color. Like blonde and brown. I don't know why my eyebrow color is changing.
My eyebrows are changing colors?
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