The situation that causes children to appear black and thin mainly includes the following aspects: first, due to malnutrition, the child is lighter, dry skin, black and thin. This type of situation should be given timely treatment to regulate the spleen and stomach, such as the application of ginseng and white atractylodes granules, yam porridge, etc., after the child’s spleen and stomach function recovery, the body thin, small, dark situation will be improved. Second, due to genetic diseases, such as congenital adrenocortical hyperplasia, often appear black and thin, and skin pigmentation is also more obvious, the child should be given timely application of hydrocortisone and other alternative treatment. Again, due to family genetics, the child’s parents are often thin and skin is darker, which is a physiological genetic factor and does not require special treatment.