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:

  • 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


SOURCES: National Institutes of Health. Habif TP, et al. (2005). Psoriasis and other papulosquamous diseases. In Skin Disease: Diagnosis and Treatment, pp. 106-115. Philadelphia: Elsevier Mosby. Stern DK, Lebwohl MG (2005). Papulosquamous eruptions. In RE Rakel, ET Bope, eds., Conn's Current Therapy, pp. 906-914. Philadelphia: Elsevier Saunders. Abel E, Lebwohl M (2005). Psoriasis. In DC Dale, DD Federman, eds., ACP Medicine, section 2, chap. 3. New York: WebMD.

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