National Psoriasis Foundation

About Psoriasis

There are five types of psoriasis. The most common form, plaque psoriasis, appears as raised, red patches covered with a silvery white buildup of dead skin cells. Psoriasis can occur on any part of the body and is associated with other serious health conditions, such as diabetes, heart disease and depression.

Symptoms and Diagnosis

Psoriasis is an autoimmune disease that causes raised, red, scaly patches to appear on the skin. Learn more about the symptoms of psoriasis and how it is diagnosed »

Types of Psoriasis

Psoriasis appears in a variety of forms with distinct characteristics. Typically, an individual has only one type of psoriasis at a time. Learn more about the types of psoriasis »

Specific Locations

Psoriasis can show up anywhere—on the eyelids, ears, mouth and lips, skin folds, hands and feet, and nails. The skin at each of these sites is different and requires different treatments. Read more about where psoriasis shows up »


Psoriasis can be mild, moderate or severe. Your treatment options may depend on the severity of your psoriasis. Read more about psoriasis severity levels »


Researchers believe that for a person to develop psoriasis, the individual must have a combination of the genes that cause psoriasis and be exposed to specific external factors known as "triggers." Read more about what causes psoriasis »