1, under normal circumstances, the tiger's mouth should be red. When the green spasm is prominent, it means that there is something wrong with the liver, especially the position of the thumb and little finger of the palm. When the veins stood out, it showed that there was something wrong with the liver, and there were too many toxins accumulated in the liver.

2, if the tiger's mouth is blue and black, it means that there is an accumulation of liver fire.