There are many types of urticaria, and physical urticaria is one of the most common types. Many people can see this when they take a bath and a person develops redness all over the body with swelling after rubbing the bath, which is probably physical urticaria. Some people make fun of bitterness and write the name of their loved ones on the back of the patient, etc., are manifestations of physical urticaria. 1, skin scratching disease within 5 minutes after light pressure is produced in the pressure area erythema, wind mass, accompanied by itching. This patient is associated with chronic urticaria, but this condition can also occur in regular people. 2. Cholinergic urticaria mainly affects young people, with lesions occurring on the trunk and extremities. Small, extremely itchy papular urticarial clusters appear after exercise, emotional stress or heat. 3. Stress urticaria is relatively rare. It may be one of the manifestations of common chronic urticaria. Painful, swollen, hard, nodular lesions are produced several hours after pressure is applied. The clusters can last for one or two days. 4. Other physical urticaria may be triggered by cold, heat, ultraviolet light, vibration, and contact with water. Sometimes there is only itching.