A skin condition that results in pale patches on a person's skin is called vitiligo. Once vitiligo first appears, it often spreads to other parts of the body.
There's no known cure for vitiligo, which has no physical symptoms aside from a loss of pigmentation, or color, on a person's skin. The difficult part of having vitiligo is that people can be stigmatized or bullied for looking different. Recently, however, more companies have been using models with vitiligo in ad campaigns to show that looking different is beautiful.