Indigo Plant Leaf Classic Formulas … Natural Herb Library

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Clears heat and resolves toxin - Liao Da Qing Ye is used for warm-toxic sore throat, febrile disease, and hot inflammatory disorders with redness and swelling.
Cools the blood - traditional usage includes blood-heat patterns with macules, rash, or heat entering the nutritive-blood level.
Assists with external toxic swellings - like the broader Da Qing Ye family, it is used for boils, hot sores, and inflammatory lesions in which heat toxin is prominent.

Da Qing Ye pairings with Ban Lan Gen and Qing Dai - classic heat-toxic throat and epidemic-heat strategy that historically drew from related blue-dye plant sources.
Heat-entering-blood formulas with Shui Niu Jiao and Xuan Shen - pattern logic for high fever, rash, and blood-level heat.
Topical or internal toxic-heat combinations with Jin Yin Hua and Lian Qiao - a practical modern continuation of its detoxifying role.

Regional materia medica sources describe Liao Da Qing Ye as bitter and cold, entering the Heart and Stomach to clear heat, resolve toxin, and cool the blood.
Traditional use overlaps strongly with Da Qing Ye, but the plant source here is specifically the dye-plant polygonum/persicaria leaf.
Because source-plant overlap has long existed in commerce, preserving the species-level identity is the main value of this separate monograph.