Knee meniscus tear package after skin infection, redness, swelling and itching, considering that may be caused by drug allergies, first of all, it is recommended to stop the drug in a timely manner, to stop continuing to use the drugs that cause the above symptoms, you can use anti-allergy drugs, glucocorticoid drugs and so on. 1. Stop: first of all, you should immediately stop the continued use of drugs, will be timely removal of the package of drugs, can be appropriate to the local red, swollen and itchy skin cleaning, washing residual drugs on the surface of the skin. 2. Anti-allergic drugs: if the symptoms are more serious, you can use loratadine, cetirizine and other anti-allergic drugs to help reduce the allergic reaction. 3. Glucocorticoid medication: topical glucocorticoid medication can be used, such as hydrocortisone cream, dexamethasone cream and so on. It is important to note that the use of previous medications should be stopped immediately after the appearance of the above symptoms. The other drugs mentioned above need to be used in strict accordance with the doctor’s instructions, and should not be used blindly on their own to avoid adverse reactions.