Itchy red marks on the body when scratched are mostly considered to be related to artificial urticaria, in which the patient’s skin is irritated and then appears as a linear elevation. Artificial urticaria is characterized by the appearance of striae along the skin after scratching or scratching with a blunt instrument for a few minutes, with or without itching, which may subside after about half an hour. The etiology of artificial urticaria has not been clearly defined, and may be related to the vasoactive mediators released by skin mast cells due to a variety of skin stimuli, and may also be triggered by factors such as bacterial infections, cold, and emotions. The itchy body when scratching the red marks are considered to be caused by artificial urticaria, it is recommended that the patient go to a regular hospital, relevant examinations, to clarify the cause of the disease.