One major goal in facial masculinization surgery is surgical masculinization of the forehead, as it makes up 30% to 40% of the whole face.
The surgeon focuses on increasing the brow bossing (brow ridge), or the bone that is under the eyebrows. They may also change the slope of the forehead and the flat area of the forehead.;
References
Deschamps-Braly JC, Sacher CL, Fick J, Ousterhout DK 2017). First Female-to-Male Facial Confirmation Surgery with Description of a New Procedure for Masculinization of the Thyroid Cartilage (Adam’s Apple). Plastic and Reconstructive Surgery: April 2017 139:4 pp. 883e-887e https://doi.org/0.1097/PRS.0000000000003185
Resources
Deschamps-Braly Clinic (deschamps-braly.com)