The face is blue and gray on the surface of the cold bundle and the face is blue and gray on the internal node of Yin cold. The former is due to the external wind and cold, and the Wei-Yang is blocked, therefore, the pale face is accompanied by vicious cold and fever, no sweating. The former is due to external wind-cold, which inhibits Wei-Yang. The latter is due to external cold, or over-eating cold, Yang is depleted, Yin is cold, Qi and blood are blocked, so the face is blue and gray accompanied by acute abdominal pain, cold limbs and mouth, clear urine and loose stools, and sunken and tight pulse. The two can be differentiated as one is superficial cold and the other is internal cold. The two have the signs of blood stasis, but there are differences in the degree and accompanying symptoms. The former is due to the failure of heart and kidney yang. Weakness of blood transport. The former is due to deficiency of Qi and blood stasis, failure of warmth and warmth, and failure of water and dampness to transform, so the greenish-gray face is accompanied by palpitations and shortness of breath, suffocation of the chest. Cold body and limbs or hazy and sleepy, little urination and swelling, blue lips and tongue, weak or sunken pulse, etc. The latter is caused by the paralysis and obstruction of the heart chakra due to old age and weakness or long-standing deficiency of the disease, and the stasis of the heart chakra is more serious than the former. The pain leads to the inner arm of the shoulder and back, and the pulse is thin and astringent or knotted. Heat moves liver and wind and the face is blue and gray: This is caused by hyperthermia, which burns the liver meridian and turns fire into wind, so the face is blue and gray with high fever and thirst. Twitching of the extremities, corkscrew, confusion, red tongue with yellow coating, and stringy pulse, mostly seen in children. In children with high fever, a greenish-gray face with a prominent appearance between the eyebrows, nose and lips is a precursor of wind.