《黄帝内经·灵枢·五色》
病色积聚不散，为血液凝结而形成积聚。积聚面部的表现，有的是方，有的是圆，有的在左边，有的在右边，都和病色的表象相一致。
女子在于面王，为膀胱子处之病，散为痛，搏为聚，方员左右，各如其色形。
Unresolved stagnation of pathological color indicates the formation of stagnation due to blood coagulation. The manifestations of stagnation on the face can be square, round, on the left, or on the right, all of which correspond to the appearance of pathological color.