What is psoriasis?

Psoriasis is a common, chronic disorder characterized by raised, inflamed lesions that join together to form plaques. The plaques have distinct borders and are covered with flaky scales. Psoriasis is not contagious, but is related to hereditary factors. It is highly variable and often quite different from person to person. It may be no more than a minor cosmetic problem or quite severe, but most cases are mild to moderate. There may be many remissions and flare-ups, but prolonged remissions are rare.

How common is psoriasis?

According to the National Institute of Arthritis and Musculoskeletal and Skin Diseases, about 2 percent of all people in the United States have psoriasis. Although the onset of the disease can occur any time in life, there are two peaks: from 20 to 30 years and from 50 to 60 years of age. In most cases, onset occurs before the age of 40 years. Men and women are equally affected by the disease, but onset is typically earlier in women. It also occurs earlier in people with a family history of psoriasis. Psoriasis is more common in Caucasians than in other races.

How dangerous is psoriasis?

Most cases of psoriasis are not life-threatening, but severe cases may lead to secondary infections, some of which may become serious. Adverse reactions to the aggressive treatment therapies that may be used in severe psoriasis may occur in some patients.

What does psoriasis look like?