Some people who seek facial masculinization surgery make changes to their lips, which can be their upper lip, lower lip or both. This typically involves reducing the size of the lips.
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
Deschamps-Braly Clinic (deschamps-braly.com)