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Types of Psoriasis

Types of Psoriasis Overview

Psoriasis is a chronic disease of the skin that affects approximately 5.5 million people in the United States. Typical characteristics of psoriasis are red, dry, patches of skin and inflammation. Psoriasis is not contagious and can be inherited. A brief overview of each type is provided below. 



Next: Plaque Psoriasis »

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Types of Psoriasis

Psoriasis Overview

Psoriasis is a common and chronic skin disorder. Plaque psoriasis is the most common type of psoriasis and is characterized by red skin covered with silvery scales and inflammation. Patches of circular to oval shaped red plaques that itch or burn are typical of plaque psoriasis. The patches are usually found on the arms, legs, trunk, or scalp but may be found on any part of the skin. The most typical areas are the knees and elbows.


Plaque psoriasis on the elbow. Image courtesy of Hon Pak, MD.


Plaque psoriasis on the back. Image courtesy of Hon Pak, MD.

Psoriasis is not contagious but can be inherited. Research indicates that the disease may result from a disorder in the immune system (See Causes). 

Factors such as smoking, sun exposure, alcoholism, and HIV infection may affect how often the psoriasis occurs and how long the flares up last.

Approximately 1-2% of people in the United States, or a...


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Psoriasis is a chronic, noncontagious, multisystem, inflammatory disorder.

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