What is the red color in Tang Yin?

At 7:00-9:00 in the morning, Yangming stomach meridian is displayed on the forehead. Arguably, Tang Yin's redness should not be a heart problem. According to Mu's theory, it can only be said that it is a liver problem. According to Qu, it can be understood that when you are tired, it should be the time when your heart sends out the most yang. In this way, Tang Yin's popularity depends on what causes it, such as whether this popularity is the external image of painstaking efforts. In other words, the function of convergence is not done well, which may be that the heart is not resting well. Tang Yin area is the confluence of several major human meridians: the bladder meridian of Foot Sun starts from the inner corner of the eye, and the stomach meridian of Foot Yangming starts from the nasal side, all of which pass through Tang Yin, and Renmai also passes through central Tang Yin. We know that the bladder meridian governs yang qi, ren meridian governs yin qi, and the stomach meridian governs qi and blood; Moreover, the forehead directly corresponds to the acupoints of Foot Yangming Meridian. Not only Tang Yin, but also the whole forehead is an external sign of human qi and blood. When qi and blood are full, Tang Yin will be full; When our qi and blood run smoothly, Tang Yin will turn slightly red. On the contrary, when our qi and blood are insufficient, our Tang Yin will sink slightly, and when our qi and blood flow is not smooth, Tang Yin will darken. Therefore, when Tang Yin sinks and turns black, it is when our qi and blood are insufficient or blocked. Think about the heart and pay attention to the appearance of the small intestine and the heart. If the small intestine goes through the seasonal period: before the end of the season (1-3: 00 pm), it is likely that there is something wrong with the heart.