Mild skin depression in the sacrococcygeal area of young children is normal, and appropriate nutrition can increase the accumulation of subcutaneous fat and reduce the depression; if there is an abnormality such as cystic masses, consultation is required. It is normal for children to have mild skin depressions in the sacrococcygeal area, where brown fat accumulates under the skin and serves as an energy storage area. The depression can be reduced by checking the nutritional status of the child and by increasing nutrition and subcutaneous fat accumulation according to the results of the examination. At the same time, it is recommended that the skin of the sacrococcygeal region be thoroughly examined to observe whether there are skin masses, whether there is redness or swelling of the skin. If there is any abnormality, it may be localized skin infection, or congenital spina bifida, etc. It is recommended to go to the hospital in time.