What to do about sides of head bulging out? Can temporalis Botox reduce this? (photos)

For unique cases where a variety of modalities could be used to treat the condition, I would suggest an in person or virtual consultation to develop a custom and effective treatment plan. It is difficult to precisely define the best option without collecting the same information. I suggest reaching out to an expert for a consultation with surgical and non-surgical methods to get a comprehensive option. Best, Dr. Emer.

Yes - most likely temporalis botulinum will be a good answer for that. You can check by feeling if that area gets larger when you chew or bite down. If so, that injection should shrink the muscle and be of benefit.
If it's bone, we can also reduce that, but it's a different process.

Botox can be injected into the temporalis and masseter muscles to help slim the face. In reviewing your photos, I do see some hypertrophy in your temples. I suspect you are likely a clencher or grinder and your temple muscle has enlarged from use. If you bite down and feel the muscle along your jawline, I suspect your masseter is also enlarged. Botox can be injected into these muscles for facial shaping. You may experience additional benefits such as reduced tension, improved headaches, etc. This treatment can be a game changer!