The ancients said: You can know it by observing it, and you mean to do it. In other words, smart doctors should infer the illness from the external changes of human body shape. By observing the "moon marks" of fingers, we can judge the cold and heat changes of human constitution.
Moon mark refers to the white arc at the root of the nail. Healthy people generally have moon marks except the little finger. The height of the moon marks on the thumb is 3 mm, and the height of the other three fingers is 2 mm. When the body is cold, all fingers have no moon marks, their nails are black, their fingers are cold, and they are afraid of cold and wind. When the constitution is cold, the two thumbs have this mark; Cold constitution, the moon marks on the ring finger and middle finger become shorter and disappear, and the height of the moon marks on the thumb and forefinger is also below 2 mm
When the body is hot, the moon marks on all fingers appear, some of which can be more than 3 mm high or even 1/2 longer than the nail length. People with hot constitution have moon marks on more than 9 fingers, and most of them are above 3 mm Fever constitution has 7-8 fingers with moon marks, and the height is mostly within the normal range. Is the answer correct?