" But one whose face has hard and rough skin, made harsh from the wind, should cook barley in water and, having strained that water through a cloth, should bathe his face gently with the moderately warm water. The skin will become soft and smooth, and will have a beautiful color. If a person’s head has an ailment, it should be washed frequently in this water, and it will be healed. V. "

― Hildegard von Bingen , Hildegard von Bingen's Physica: The Complete English Translation of Her Classic Work on Health and Healing