A hard bag grows on the bone of the brain, this condition refers to cranial osteoma, which is mainly appeared due to congenital or traumatic stimulation. This kind of cranial osteoma will grow slowly, and when it grows to a certain degree, it will be felt as a hard bag under the skin in the forehead position, and there is malignant transformation, but it is relatively rare, if the osteoma grows faster, there is a possibility of malignant transformation. Therefore, in this case, it is best to perform a CT examination of the skull and brain to see the exact location of the osteoma as well as its size to further clarify the diagnosis. Surgical measures are usually taken to remove the location of the osteoma. Usually, local anesthesia of the skin and subcutaneous tissues is applied, the skin is incised, the specific location of the osteoma is found, and a bone chisel is applied to remove the osteoma. After removal, bone wax is applied to the resection site to minimize blood leakage from the skull, and subcutaneous tissue and skin sutures are applied and pressure dressings are applied. After the surgery, it is advisable to have a CT scan of the cranium to see if there is any possibility of cranial hemorrhage due to forceful manipulation during the surgery.