Handbook of Psoriatic ArthritisAbout This Hardback Psoriatic arthritis is a chronic inflammatory form of arthritis which occurs in people with psoriasis. It causes swelling of fingers and toes, thickening of nails, depressions in the nail, and detachment of the nail from the nailbed. Certain symptoms are specific to this condition, such as enthesitis and dactylis. Psoriatic arthritis can occur in both children and adults. Genetics, obesity and psoriasis are major risk factors for