PR JEAN-DENIS LAREDO, ISM / SCIENCE PHOTO LIBRARY PR JEAN-DENIS LAREDO, ISM / SCIENCE PHOTO LIBRARY
Psoriatic arthritis of the hands, coloured X-ray. Psoriatic arthritis occurs in a small minority of patients suffering from psoriasis, a chronic skin disease in which itchy, scaly red patches develop on the skin. It is a painful condition that causes inflamed stiff joints.
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