There are several ways you can use apple cider vinegar to help treat a sunburn. Although most methods recommend apple cider vinegar before applying it to skin, there are no reliable sources that provide a specific vinegar-to-water ratio. Make sure the vinegar is well diluted, as high concentrations can cause a burning sensation.
If you have a minor burn, apple cider vinegar will come to your rescue. Dip the burned area into a vinegar and water solution to relieve pain and speed up regeneration.