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Early psoriatic arthritis symptoms may include red, scaly rashes, most commonly over the elbows, knees, ankles, feet, hands and other areas, and swollen fingers and toes in which painful, sausage-like swelling or deformities occur, particularly in the feet. In fact, foot deformities can occur quite quickly, within six months if the disease is not properly treated.
Typical deformities include clawed toes, hyperextension of the big toe and some rolling in of the ankle along with flattening of the arch. Foot pain and tendonitis can also occur, especially at the points where the tendons and ligaments attach to the bones at the back of the heel or in the sole of the foot. Back pain due to inflammation of the joints is not uncommon.
Psoriatic arthritis can also cause a condition known as spondylitis which leads to inflammation of the joints of the spine, causing lower back pain.