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Another potentially dangerous trend: the "eraser challenge." That's where you vigorously rub an eraser on your skin while reciting a certain phrase or the alphabet. The results can be disfiguring or worse. 

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In this segment of Vital Signs, some new hope for patients with vitiligo. It's an auto-immune disease that causes you to lose color in your skin. Vitiligo isn't life-threatening for the two million people in the U-S who have it, but it can be very stressful.

Dr. Amit Pandya, a professor of Dermatology at UT Southwestern Medical Center, talked about vitiligo and a treatment he’s refined to restore the discoloration.