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Understanding Psoriasis

In the United States, as many as 7.5 million people have been diagnosed with psoriasis, a chronic inflammatory skin condition. Symptoms often include red patches of skin covered by scales. These patches are called psoriatic plaques. In some cases, fingernails and toenails are affected, causing lifting, pitting, and crumbling of the nail.

  • Psoriasis affects men and women equally, but research has suggested that ethnicity may be a factor. Psoriasis is more common among Caucasians of northern European descent than among African Americans or Asians.
  • Symptoms of psoriasis usually appear between the ages of 15 and 35. About a third of people who have psoriasis have a family history of the disease.

Research has suggested that psoriasis may be linked to an overactive immune system, which causes the body to accelerate the growth of skin cells at a faster pace than usual. In skin that is not affected by psoriasis, the cells mature and reach the skin's surface every 28 to 30 days. In psoriatic skin, skin cells mature more rapidly, within about 3 to 6 days. The overproduction of skin cells forces them to pile up on the skin, resulting in plaques and lesions.

  • People with psoriasis may not have symptoms all the time. The disease can go into remission and skin symptoms are absent during this time. Triggers for a psoriatic episode may include stress, skin injury, and reaction to certain medications or cold winter weather.
  • Psoriasis is not contagious. It is not caused by a bacteria or virus. This misconception exists because plaques or lesions can resemble infected skin, but the disease is not transmitted through contact of any kind. Psoriasis is a disease that may likely be caused by a number of internal factors, including genetics and immune system malfunction.
  • Depending on its severity, psoriasis can be a minor irritation of the skin or it can be painful and disabling. If your skin condition is painful or makes it difficult to perform routine tasks, or if you are concerned about the appearance of your skin, talk to your dermatologist.

For more information about psoriasis, please visit the following resources:

Symptoms of Psoriasis
Psoriasis Risks and Related Conditions
Diagnosing Psoriasis
Treating Psoriasis

NEXT: Symptoms of Psoriasis


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Last Updated: January 19, 2009