After PPT skin test, the following precautions should be taken: 1. After pulling out the needle, cotton swabs or cotton balls should be used to press the injection site to prevent the outflow of the injected drug or subcutaneous bleeding, and the pressure should last for about 5-10 minutes. 2. 4. If there is a systemic reaction, such as a rash or dizziness, nausea, or even a drop in blood pressure, it is considered a systemic allergic reaction and must be treated immediately with anti-allergy and anti-inflammatory drugs.