Scratch urticaria is clinically known as artificial urticaria, and there are no obvious contraindications to food in this condition. Artificial urticaria is a common physical urticaria, the cause is not clear, usually due to the skin by scratching, friction and other mechanical stimuli, resulting in the release of histamine and other biologically active mediators in the body of the mast cells, so that the skin capillary permeability increased, plasma and tissue fluid penetration into the dermis and caused. There are no strict contraindications because it has little to do with food. In artificial urticaria, when the skin is stimulated with a finger or a hard tool, a clear red line of raised wind bumps will appear on the surface of the skin and may be accompanied by itching of varying degrees. This disease can gradually disappear on its own, but there are some patients with serious conditions, which will affect their life and work, so those who have the disease, should be actively under the guidance of a professional doctor for treatment.