For minor burns:

• Cool the burn to help soothe the pain. Hold the burned area under cool (not cold) running water for 10 to 15 minutes or until the pain eases. Or apply a clean towel dampened with cool tap water.
• Remove rings or other tight items from the burned area.Try to do this quickly and gently, before the area swells.
• Don’t break small blisters (no bigger than your little fingernail). If blisters break, gently clean the area with mild soap and water, apply an antibiotic ointment, and cover it with a nonstick gauze bandage.
• Apply moisturizer, aloe vera lotion or gel, or low-dose hydrocortisone cream, which may provide relief in some cases.
• If needed, take an over-the-counter pain reliever, such as ibuprofen (Advil, Motrin IB, others), naproxen sodium (Aleve) or acetaminophen (Tylenol, others).
• Consider a tetanus shot. Make sure that your tetanus booster is up to date. Doctors recommend people get a tetanus shot at least every 10 years.
• See your doctor if you develop large blisters.

Source : Mayo Clinic