After a patient is injured, if the wound is relatively deep, such as reaching the subcutaneous fat or deeper to the muscles, it is generally required to administer a tetanus shot. The most commonly used tetanus remedy in clinical practice is called tetanus antitoxin. Before administering tetanus antitoxin, a skin test must be conducted. This is because if an allergic reaction to tetanus antitoxin occurs, it can lead to anaphylactic shock, characterized by increased heart rate, decreased blood pressure, reduced blood oxygen saturation, with severe cases resulting in coma or even death. Therefore, it is clinically required to perform a skin test before administering a tetanus shot to prevent allergic reactions and the occurrence of anaphylactic shock.