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Psoriatic arthritis (PA) is a form of arthritis that occurs with the chronic skin condition psoriasis. Symptoms may vary in individuals, and may affect any joint. PA generally affects the skin first, but the symptoms of arthritis may develop before the red and silver scaly patches that generally characterize psoriasis. What Is Psoriatic Arthritis? Psoriasis is caused when the body starts attacking its own cells, in this case skin cells. In about 30 percent of all cases of psoriasis, according to the National Psoriasis Foundation, the body's immune system does not stop with attacking skin cells, but...
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