I realize that I have some white hair on my sideburns. I've noticed this before, but now that I'm growing a beard I see that on one side it is actually a long white streak going down the side of my face and up to my temple. And only on one side. I'm like a sideways skunk.
Having hair has always been more important to me than the color of it, so I've never really worried about this so much and still don't, but it is a curious little phenomenon! The streak seems to be growing.