The protrusion of the bones on the eyebrows may be due to several reasons: 1. due to genetic factors. In some patients, the protrusion is obvious due to genetic factors, and the bone here is called the arch of the eyebrow. 2. It is caused by a lesion of the soft tissue here. If the patient suffers a violent blow, a subcutaneous hematoma or aseptic inflammation may cause the area to protrude, adding up to a stiffness that causes the patient to mistake the protrusion for a bony one. 3. Due to old injuries. If the patient has a previous old fracture here, there may be an excessive enlargement of this area during the recovery process, which may cause a bony protrusion. 3. Due to an occupying lesion here, a bone wart or a bone cyst may cause a bony protrusion.