Psoriatic arthritis (PsA) is a type of inflammatory arthritis that can occur in some people who have psoriasis, a skin condition characterized by red, scaly patches on the skin. Psoriatic arthritis is an autoimmune disease, meaning that the body's immune system mistakenly attacks healthy tissues, leading to inflammation and joint damage. Here are some key features of psoriatic arthritis: Joint Inflammation: Psoriatic arthritis primarily affects the joints, leading to inflammation. This inflammation can cause pain, swelling, and stiffness in the affected joints. Association with Psoriasis: Many people with psoriatic arthritis also have psoriasis, but joint symptoms may precede skin symptoms in some cases. Psoriasis can affect the skin, nails, and sometimes the joints. Variable Symptoms: Psoriatic arthritis can affect any joint in the body and may vary widely from person to person. Some individuals may experience mild joint discomfort, while others may have severe, disabling arth...