Chemical burns should be rinsed with slow-flowing water for at least 20 minutes, taking care that the water does not carry toxic chemicals onto other parts of the body, according to WebMD. If the wound is small, it may be covered loosely with a dry, sterile cloth or gauze.
Any clothing or jewelry that came into contact with the contaminant should be removed if possible, according to the Mayo Clinic. The wound should be gently rewashed if the burning sensation persists, and medication such as aspirin, ibuprofen or acetaminophen should be used to treat the pain. A moisturizer may be applied to the burn to prevent itching after the wound is healed over, according to Drugs.com.