Third, we can see meridians
Meridians syetem goes to as deep as the level of viscera and as shallow as the skin, and its network penetrates the entire body. Sick visceral information can be projected onto the skin surface, showing different colors. So the nature of meridians lesions can be evaluated on the basis of the changes of skin colors.
Meridians are connected to the skin surface with large collaterals, minute collaterals, superficial collaterals and twelve meridians cutaneous areas. Let’s look at the color change of Yuji(LU10) acupoint to explain the case. Yuji acupoint is the Brook point of hand Taiyin Lung meridian, where the variation in skin color reflects the features of the Lung medirian lesion. The blue color of Yuji skin mirrors the cold in the Lung meridian, and the red color shows pathogenic heat. If the skin appears in green, black and red colors intersection, it means the Lung meridian suffers from simultaneous occurrence of cold and heat syndromes. Yuji acupoint under Lung meridian skin is distributed in the shape of a funnel, located at the first metacarpal midpoint radial dorso-ventral boundary. The needle inserted 1.0-1.6 centimeters vertically will reach the point. The specific anatomical arrangement is as follows from shallow to deep: the skin, subcutaneous tissue, abductor pollicis brevis and opponens pollicis, flexor hallucis brevis aponeurosis and the first metacarpal periosteum[12]. Yuji acupoint’s core is composed of staggered aponeurosis, periosteal and other fibrous connective tissues, which are parts of the triple energizer-meridian system. Skin surface, that is cutaneous areas of Yuji acupoint, is the open window of Lung meridian. The color change shows that meridians are tangible, functional and anatomic structures.