After a burn, if there is persistent burning pain, you can first rinse with running cold water until the pain eases. Then apply toothpaste, aloe, or camphor oil on the surface of the burn to cool and relieve pain, alleviating symptoms. If necessary, cover the burned area with a sterile gauze and then apply ice. This can help relieve pain. If needed, pain relief medication such as painkillers or celecoxib can be taken orally. If the pain is severe, you can also go to the hospital for an intramuscular injection of dexamethasone or butorphanol to relieve symptoms. Also, pay attention to diet; avoid spicy, stimulating foods and foods that cause inflammation. Drink plenty of water and eat fresh vegetables and fruits. (Medication should be used under the guidance of a physician.)