Negative result of tetanus skin test for allergy means: there is no change in the local area of injection, and there is no systemic symptom of discomfort. Positive criteria include local reactions such as redness, swelling, itching, etc. and systemic reactions such as dizziness, panic, anaphylaxis, etc. 1. Local reaction: If allergy occurs, the local injected skin will appear red, swollen, hard nodules larger than 1.5 cm, and the surrounding redness or pseudo-foot area is larger than 4 cm. Itching of the skin at the injection site. 2. Systemic allergic reaction: such as nausea, vomiting, dizziness, panic, chest tightness, shortness of breath, and in severe cases, there may be pale, cold sweat, drop in blood pressure, urinary and fecal incontinence, and even anaphylactic shock and other symptoms. Tetanus skin test allergy, as long as the above local reaction or systemic reaction belongs to the phenomenon of allergy, this situation can not be injected tetanus antitoxin, you can switch to anti-tetanus immunoglobulin. If discomfort occurs, please inform your doctor for prompt treatment.