The reasons for the bone bulge in the middle of the forehead are as follows: 1, clinically, if the patient’s frontal bone part is subjected to direct external force, injuring the muscle tissue of the frontal bone part produces local bleeding, and does not get absorbed in time, gradually forming adhesions calcification, forming subcutaneous cysts, in appearance there will be a bulge in the middle of the forehead. 2, the patient occurs abnormal osteophytes in the frontal bone part or appears frontal bone The patient can also have this kind of clinical manifestation, and it will be accompanied by local pressure pain. 3, the patient suffers from the frontal bone part of the occupying lesion will also produce this kind of clinical manifestation, can make a clear diagnosis by taking CT film or X-ray of the frontal bone. Patients with this clinical manifestation need to consult a doctor in time, after the doctor to make a clear differential diagnosis, and then take symptomatic treatment, you can cure or alleviate this phenomenon.