Yellow Dock is an astringent blood purifier specific for acute and chronic skin diseases, including eruptions , psoriasis, itching welts and eczema. Because this herb helps the liver to use iron, it helps build blood.
Since Yellow dock detoxifies the liver, it treats jaundice, hepatitis, liver congestion and poor fat absorption. As well, it stimulates bile secretion, causing a laxative action and relieving constipation without causing griping or pain. Externally it is applied to stop bleeding of wounds, hemorrhoids and swellings.
from Healing with the Herbs of Life, Lesley Tierra, Crossing Press, 2003.