What Causes Urticaria and How Can You Prevent It? Urticaria, commonly known as hives, is a skin condition characterized by raised, itchy welts that can appear anywhere on the body. These welts, often red or skin-colored, may vary in size and shape and can be acute (lasting less than six weeks) or chronic (persisting beyond six . Understanding the causes of urticaria and implementing preventive measures can significantly reduce its occurrence...