Generally children are getting darker and malnutrition is not very relevant, because malnutrition is often caused by children’s skin yellow and no luster, rarely cause children’s skin is getting darker, cause children are getting darker, mainly due to the following reasons: 1, due to the children usually sun too much caused by the children in the outdoor activities of the time is too long, will cause too much ultraviolet irradiation, resulting in skin 2, due to children suffering from congenital adrenocortical hyperplasia caused by children after the occurrence of congenital adrenocortical hyperplasia will cause the skin black, and often accompanied by anorexia, nausea, and the body of the ACTH value rise.