A sliding mass at the back of the head of an infant may be an enlarged lymph node, which requires anti-infective treatment; it may also be a sebaceous cyst or a subcutaneous lipoma, which requires surgery or other methods of treatment. 1. Lymph node enlargement: the sliding mass at the back of the baby’s head may be caused by the infection of neighboring tissues and organs, resulting in inflammation, lymph node enlargement formed along the lymphatic drainage, and need to go to the hospital in time for blood tests, and when it is clear that the bacterial infection is present, cephalosporin and other antibiotics can be used under the guidance of the doctor for treatment. 2. Sebaceous cysts: the sliding mass at the back of the baby’s head may also be sebaceous cysts, which should be positively surgically removed, otherwise sebaceous cysts may cause headaches after secondary infection. 3. Sebaceous adenoma: the sliding mass on the back of the head of the baby may be sebaceous adenoma, sebaceous adenoma does not need special treatment, regular follow-up observation can be. There may be other reasons for the sliding lumps on the back of the head of infants, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.