Castor oil. Another good home treatment for relieving blisters is castor oil. When applied regularly, castor oil helps the damaged area stay moisturized. In turn, this relieves itchiness, which helps to speed the healing process along. This treatment is simple to apply. Just massage castor oil into your blister and let it sit overnight. Repeat this process each night for two or three nights. Another method is to combine three teaspoons of the oil with four ounces of white vinegar. Massage this healing cocktail into your blister.
