Symptoms of tetanus skin test allergy usually include enlarged dermatomes, edema-type windmills around the skin test site, and even respiratory difficulties in severe cases. 1. If the dermatome becomes larger than 0.5 centimeters in diameter after the skin test, it often indicates that the body has an allergic reaction to the drug. 2. If there are edematous masses around the skin test site, accompanied by marked itching and swelling around the skin, this may also indicate an allergic reaction to the drug. 3. In severe cases, there will be dizziness, nausea, panic and other manifestations, and some people may even show anaphylactic shock. If the skin test result shows that the body has an allergic reaction to the drug, it is recommended to report to the doctor in time, and after 30 minutes of observation, the symptoms have been relieved before leaving, and then to pay attention to this kind of drugs, avoid contact or use. If there is any discomfort, it is recommended to consult a doctor in a timely manner, under the guidance of a specialized doctor to identify the cause of the disease and carry out targeted treatment.