Excerpted from Bensky: Chinese Herbal Medicine Materia Medica, 3rd ed.

• Drains damp-heat, particularly from the lower burner:  for such problems as thick, yellow vaginal discharge, foul=smelling diarrhea, or dysenteric disorder.  Also for damp-heat pouring downward or hot leg qi with such symptoms as red, swollen, and painful knees, legs, or feet.  Also for damp-heat jaundice*
• Drains Kidney fire:  for ascending Kidney fire with signs of yin deficiency such as steaming bone disorder, night sweats, afternoon fevers and sweating, sometimes accompained by nocturnal emissions and spermatorrhea*
• Drains fire and resolves fire toxicity:  for fire toxin-generated sores and damp lesions of the skin*