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What does psoriatic arthritis affect?

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Up to a third of people who have psoriasis will get psoriatic arthritis. Psoriasis is a skin disease that causes a red, scaly rash, often over the elbows, knees, ankles, feet, and hands. It can also affect your nails. Both of these diseases happen because your immune system attacks your body instead of something from outside.

SOURCES: National Psoriasis Foundation. Arthritis Foundation. American College of Rheumatology. WebMD Medical Reference "Psoriasis."

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SOURCES: National Psoriasis Foundation. Arthritis Foundation. American College of Rheumatology. WebMD Medical Reference "Psoriasis."

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Who can get psoriatic arthritis?

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