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Psoriatic arthritis and RA have many symptomatic similarities and are therefore often confused. This includes general leg and muscle pain, swelling and stiffness of your joints. However psoriatic arthritis is not always the first condition developed. 85% of all PA sufferers develop psoriasis first. Psoriasis is not a comorbid ailment stemming from RA, it is rather an asymmetric joint affliction which has no nodules.
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