Psoriasis is a chronic autoimmune skin condition characterized by the development of red, scaly patches on the skin. These patches are often itchy and can appear on any part of the body, including the scalp, knees, elbows, and lower back. The condition occurs when the immune system sends out faulty signals that cause skin cells to grow too quickly, resulting in the buildup of dead skin cells on the surface of the skin. Psoriasis can also affect other parts of the body, including the nails and joints, leading to nail changes and joint pain in some cases. While there is currently no cure for psoriasis, there are many treatments available to help manage the symptoms and reduce the frequency and severity of flare-ups.