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    Psoriasis: Test Your Knowledge

    Psoriasis affects up to 7.5 million Americans, according to the National Institutes of Health. Psoriasis is more common in adults than children and affects males and females equally.

    Psoriasis affects:

    Recommended Related to Psoriasis

    What Causes Psoriasis?

    Psoriasis turns your skin cells into Type A overachievers: They grow about five times faster than normal skin cells. And your body can't keep up. The old ones pile up instead of sloughing off, making thick, flaky, itchy patches. Why do these cells go a little haywire? There's more going on under the surface of this skin disease. Researchers think something sets off your immune system. The exact reason is a mystery. But it's likely a combination of genetics and triggers.

    Read the What Causes Psoriasis? article > >

    • 2% to 3% of people throughout the world
    • About 2.2% of people in the United States
    • Some cultures more than others. Worldwide, psoriasis is most common in Scandinavia and other parts of northern Europe. It appears to be far less common among Asians and is rare in Native Americans, according to the American Academy of Dermatology.

    WebMD Medical Reference

    Reviewed by Stephanie S. Gardner, MD on November 22, 2015

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