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What Is Psoriatic Arthritis?

 

Psoriatic arthritis (PsA) is a form of inflammatory arthritis. It affects about 1 million people in the United States, or 30% of people who have psoriasis. Psoriasis is a skin disease that causes a red, scaly rash, most often on your elbows, knees, anklesfeet, and hands.

Psoriatic arthritis is an autoimmune condition. It happens when your body’s immune system attacks healthy tissue by mistake. PsA most often affects your skin and your joints, which can become swollen, stiff, and painful. Over time, if you don’t treat it, the inflammation can damage joints and tissues.