<p>Psoriatic arthritis is a condition that causes swelling and pain in and around the joints. It can affect a number of joints including the fingers, wrists, toes, knees, ankles, elbows and shoulder joints; as well as, the spine and lower back joints. Psoriatic arthritis also affects tissues surrounding the joints, such as the tendons and ligaments. This form of arthritis may cause a swelling of the whole digit called “sausage” finger or toe. It also may cause skin inflammation, particularly on the elbows, knees and scalp.</p>
