Botox injections and their outcomes will depend on the injector's experience with that particular muscle group.
Injections into large muscle groups are typically done for functional issues, such as in cerebral palsy or for migraines, and are done by neurologists or paediatric orthopaedic surgeons.
Botox injections to the trapezius for aesthetic modification are typically done by doctors in the field of aesthetics, such as plastic surgeons, dermatologists, or those in aesthetic medical practice. Not everyone does it, however, so it's ultimately best to ask your doctor if they have experience with this indication.
