Dock leaf

The leaves are often applied externally as a rustic remedy in the treatment of blisters, burns and scalds. The root contains tannin and is astringent and blood purifier. A tea made from the roots has been used in the treatment of jaundice, whooping cough, boils and bleeding. An infusion of the root has been used as a wash, especially for children, to treat skin eruptions. One report says that the root has been used as a contraceptive to stop menstruation. The root is harvested in early spring and dried for later use. Source: https://pfaf.org/