Your description suggests premature closure of the metopic sutures in the skull bone. The description of firmness suggests that the area does consist of bone;so, alternatively, this might be some type of benign tumor in the bone.

Surgery can improve the cosmetic appearance of the skull in situations of premature metopic suture closure. Results long-term are reported as quite good. The surgery is best done in the opinion of several experts in neurosurgery at an earlier age than your daughter for optimal success.

I suggest that you discuss your daughter's diagnosis and treatment plan with the surgeon or her pediatrician before proceeding with any type of surgery.