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Women may experience leukorrhea that is greenish in color, and in severe cases, it resembles mung bean juice, being thick, sticky, continuous, and having a fishy, foul odor. This is referred to as "Green Leukorrhea" (Qing Dai). Green leukorrhea is caused by damp-heat in the Liver meridian. The Liver belongs to Wood in the Five Elements, and the color of Wood is green. Leukorrhea flowing like mung bean juice clearly indicates a pathology of Liver Wood. However, Liver Wood delights in the nourishment of Water, and Dampness is also an accumulation of Water. It seems that Dampness is not what Liver Wood dislikes; why does it form the syndrome of Green Leukorrhea? It is unknown that while Water is what Liver Wood likes, Dampness is actually what Liver Wood dislikes, because Dampness is the Qi of Earth (Spleen). Combining what is disliked with what is liked inevitably leads to conflict. Since the nature of the Liver is violated, the Qi of the Liver must become rebellious (counterflow). Qi desires to ascend, while Dampness desires to descend; these two forces pull against each other, stagnating in the Middle Jiao, and then flowing into the Dai Mai (Girdle Vessel), finally exiting from the genitalia. The color being greenish-blue is precisely due to its undergoing the Qi transformation of Liver Wood. When the counterflow is mild, the Heat is mild, and the color is green; when the counterflow is severe, the Heat is severe, and the color is blue-green. It seems that treating green leukorrhea is easy and treating blue-green leukorrhea is difficult, yet there is no difficulty in either. By clearing the Fire of Liver Wood and promoting the water flow of the Bladder, both green and blue-green leukorrhea can be eliminated.

The formula used is Modified Xiaoyao San (Free and Easy Wanderer Powder).
Fuling (Poria) (5 qian), Baishao (White Peony Root) (stir-fried with wine, 5 qian), Gancao (Licorice Root) (used raw, 5 qian), Chaihu (Bupleurum Root) (1 qian), Yichen (Artemisiae Scopariae Herba) (3 qian), Chenpi (Citri Reticulatae Pericarpium) (1 qian), Zhizi (Gardeniae Fructus) (3 qian, stir-fried).
Decoct with water and take orally. After two doses, the color becomes pale; after four doses, the green-blue leukorrhea ceases completely, and no further doses are necessary. The principle of Xiaoyao San is to resolve Liver constraint (depression); why does it treat Green Leukorrhea so miraculously? This is because damp-heat remains in the Liver meridian due to Liver Qi constraint. Constraint inevitably leads to counterflow, and Xiaoyao San is most effective at resolving Liver constraint and counterflow. Once the constrained and counterflowing Qi is resolved, damp-heat cannot remain easily. Furthermore, adding Yichen to promote dampness drainage and Zhizi to clear heat, the Liver Qi becomes clear, and how could green-blue leukorrhea arise! This is why this formula is miraculous and efficacious. If one merely treats Green Leukorrhea with dampness-draining and heat-clearing methods while ignoring the Liver Qi, how could the leukorrhea ever stop!

Marginal Note: Spleen Earth prefers dryness and dislikes dampness. When Spleen Earth is diseased by dampness, Liver Wood will surely invade it. Liver Wood is also bullied by the damp-Earth Qi, so the Liver also becomes diseased. Removing Danggui (Angelica Sinensis) from Xiaoyao San is extremely ingenious.

Verse:
Leukorrhea green, even blue-green, thick and dense,
Caused by damp-heat lingering in the Liver meridian.
Promote Bladder water, clear Liver fire,
Green and blue-green discharges will naturally heal.
Modified Xiaoyao San for Green Leukorrhea,
Chaihu, Fuling, Baishao, Gancao.
Chenpi, Yichen, stir-fried Zhizi,
Drain dampness, clear heat, and soothe the Liver.