Apply a poultice of cosmetic clay, aloe vera juice, and peppermint essential oil to the rash. Clay helps dry the rash to promote faster healing, aloe vera heals skin, and peppermint oil is cooling and temporarily relieves itching. Mix together 2 tablespoons of cosmetic clay with enough aloe vera juice to make a thin, spreadable paste, and blend in 2 drops of peppermint essential oil. Spread this mixture onto the rash and let it dry. Leave it on for several hours and let it flake off or wash it off. Reapply as needed.