The forehead corresponds to the heart and lungs, the nose corresponds to the spleen and stomach, and the parts below the nose correspond to the urinary and reproductive organs. There is a record of "five-color diagnosis" in Huangdi Neijing, and visceral diseases are diagnosed according to the different facial color changes. The five colors are green, red, yellow, white and black. Green corresponds to liver disease, red to heart disease, yellow to spleen disease, white to lung disease and black to kidney disease. (SOSO)