An itchy, red patch when you scratch your body may be related to artificial urticaria. Artificial urticaria is a special type of urticaria, with ordinary urticaria is different from the artificial urticaria people often have no reason to itch the skin, but the surface of the skin will not immediately appear “wind,” but with the fingernail or other blunt objects on the skin after scratching, the localization of the scratch can appear a road, elevated in the skin. surface of the skin. The cause of artificial urticaria is mostly due to the expansion of subcutaneous capillaries and increased permeability after the skin is physically stimulated by the outside world, and a kind of allergic reaction occurs. For people suffering from artificial urticaria, it is necessary to go to the hospital as soon as possible, and under the guidance of the doctor for drug treatment.