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Who is affected by psoriasis

Psoriasis is more common in adults than in children. It is equally common in women and men.1

Psoriasis affects:

Recommended Related to Psoriasis

Understanding Psoriasis -- Symptoms

The symptoms of psoriasis include: Areas of itchy, scaly skin on the scalp, knees, elbows, and upper body; these deep-pink, raised plaques 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, a...

Read the Understanding Psoriasis -- Symptoms article > >

  • 1% to 3% of people throughout the world.2
  • About 2% to 3% of people in the United States. Every year about 150,000 people in the U.S. are newly diagnosed with psoriasis.1
  • Some cultures more than others.3 For example, it is common in Japanese people but not in native North Americans or native South Americans. It is uncommon among blacks in tropical areas, but it is seen more often among blacks in temperate areas, such as in the United States and Europe, where the year-round climate is moderate.


  1. Gudjonsson JE, Elder JT (2008). Psoriasis. In K Wolff et al., eds., Fitzpatrick's Dermatology in General Medicine, 7th ed., vol. 1, pp. 169-193. New York: McGraw-Hill Medical.

  2. Habif TP, et al. (2005). Psoriasis and other papulosquamous diseases. In Skin Disease: Diagnosis and Treatment, pp. 106-115. Philadelphia: Elsevier Mosby.

  3. Abel E, Lebwohl M (2008). Psoriasis. In EG Nabel, ed., ACP Medicine, section 2, chap. 3. Hamilton, ON: BC Decker.

By Healthwise Staff
Primary Medical Reviewer Kathleen Romito, MD - Family Medicine
Specialist Medical Reviewer Alexander H. Murray, MD, FRCPC - Dermatology
Last Revised January 6, 2010

WebMD Medical Reference from Healthwise

Last Updated: January 06, 2010
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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