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Ask Bella: Where Did That White Streak Come From?

As the years pass, so do the grays of our lives. (Groan, I know.) Yet some people, like Stacy London, have a streak of whitish hair on an otherwise solid mane. I wondered if that was a style choice, until on one episode of What Not To Wear, Stacy explained that she's had it since she was a child.

Curious why this happens? Learn about it when you

.

Hair color is controlled by several different genes, each contributing to the pigment color. In addition, the genes determine the color's concentration in the hair shaft. If a patch of skin had a somatic mutation, it could inactivate one or more genes that control the pigment deposition, leaving a lighter patch of skin on her scalp similar to a birthmark. The patch will remain pale and can also result in a paler, or different, color hair growing out of it. There you go.

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