A hard bone bulging from the forehead is more commonly a bony mass such as osteoma or osteochondroma, or a soft tissue mass such as a sebaceous cyst or lipoma. You can consider going to the hospital for an interview with your doctor, who will make a preliminary analysis with the physical examination. If it is a fixed hard mass, the possibility of bony masses is high, you can improve the local CT and 3D reconstruction, which can more accurately determine what nature of bony masses belong to. If it is a soft tissue mass, there is usually a certain degree of activity, and ultrasound can be improved. For raised masses, whether they are bony chondromas or osteomas, or soft tissue sebaceous cysts or lipomas, the larger ones can be surgically removed and generally cured completely. Routine postoperative pathological examination is performed to exclude other masses.