Psoriatic arthritis
Experts estimate that approximately 30 percent of people with psoriasis (a skin condition characterized by itchy, scaly rashes and crumbling nails) also develop a form of inflammatory arthritis called psoriatic arthritis—inflammation of the skin and joints. While the cause of psoriatic arthritis is unknown, some people may be predisposed to it, and family history may be a factor. Non-steroidal anti-inflammatory medications and exercise can provide temporary relief, says Dr. Goitz.