Apply hydrocortisone cream or calamine lotion. Cover the area with a bandage. If there's swelling, apply a cold compress to the area. Take an antihistamine to reduce itching, swelling, and hives.
Stop the burning process as soon as possible. Cool the burn with cool or lukewarm running water for 20 minutes, as soon as possible after the injury. Never use ice, iced water, or any creams or greasy substances such as butter. Keep yourself or the person warm.