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舌色青紫晦暗，甚则如猪肝色，舌下络脉迂曲怒张。
Tongue dark bluish-purple, sometimes resembling the color of liver, with tortuous, engorged sublingual veins.
主血瘀证；气血运行不畅，瘀阻脉络，常见于心脉痹阻、瘀血内停诸证。
Indicates blood stasis; obstructed qi and blood circulation with stasis in the vessels—commonly seen in heart-vessel obstruction and patterns of internal static blood.
@misc{bencaodian-purple-dark,
author = {{Bencaodian Editorial}},
title = {zǐ àn shé 紫黯舌 (Dark Purple Tongue)},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/tongue/purple-dark},
urldate = {2026-04-09},
note = {CC BY-SA 4.0}
}