Psoriatic arthritis: symptoms, causes, treatment and more

About 30% of people with psoriasis—a common autoimmune disorder that causes itchy or sore patches of thick, red, white or silver-colored skin—also develop psoriatic arthritis (PsA). PsA causes pain, stiffness and swelling around the joints, most often in the fingers and toes. If you start to notice these symptoms, getting medical care early is a must. Over time, PsA can lead to permanent joint damage.