There is a pit at the back of the head, the common causes are the following: First, due to congenital development, normal development, which does not cause symptoms in the head, and no other parts of the body. In this case, treatment is not recommended and is not necessary. Second, previous history of trauma, trauma and cause the skull fracture in the back of the head area, but did not buckle reset, often this grows down, can cause the back of the head area of the pit, touch softer. In this case, if there is no obvious pressure on the surrounding old tissues, related treatment is also not recommended. The above questions are for reference only, please refer to the doctor’s face-to-face guidance for specific medication and treatment.