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About 10 percent of patients with type II have vitiligo, or loss of pigment, on areas of the skin.
The other possible cause is a condition called vitiligo, in which the pigment is lost in large irregular patches.
Most strongly affected are parents of vitiligo patients as children are rejected by other children and adults alike.
Some also offer support to vitiligo sufferers and their families, as well as providing information about the disorder.
Patches of vitiligo skin have no natural protection against the sun 's rays.