A hornet sting should be treated promptly as it is usually toxic and will most likely cause other maladaptive reactions. The following methods can be used: 1) scrubbing the affected area with edible vinegar, white vinegar or lemon water, as hornet venom is an alkaline toxin and needs to be cleaned with an acidic liquid. 2) removing the residual stinger from the wound with pliers to avoid inflammation. 3) applying erythromycin ointment locally for anti-inflammatory and pain-relieving effects, which can also prevent infection in time. If the pain is severe, you can take ibuprofen or other drugs for pain relief. In summary, once you have been stung by a hornet, you should go to the hospital for a comprehensive examination and take the appropriate treatment in a timely manner.