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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:

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Understanding Psoriasis -- Symptoms

The symptoms of psoriasis include: Patches of itchy, scaly skin on the scalp, knees, elbows, and upper body. These deep-pink, raised areas of skin have white scales. Psoriasis on fingernails and toenails can make the nails become thick, pitted, and discolored; nails may separate from underlying nail bed. Red, scaly, cracked skin with tiny pustules on the palms of the hands and/or feet; you may have pustular psoriasis. Symptoms of psoriatic arthritis include: Stiffness, pain, and...

Read the Understanding Psoriasis -- Symptoms 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

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Reviewed by Louise Chang, MD on September 29, 2009
© 2009 WebMD, LLC. All rights reserved.
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