Psoriatic Arthritis By Kinanah Yaseen, MD, Cleveland Clinic Reviewed / Revised Nov 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Swelling of a Distal Interphalang... Psoriasis (Dactylitis) Psoriasis (Scalp) Psoriasis (Elbows) Psoriatic arthritis is a seronegative spondyloarthropathy and chronic inflammatory arthritis that occurs in people with psoriasis of the skin or nails.