Very Large Head and Large Face?

Hi, I am an adult woman with a very large face and large head. I am healthy otherwise. I have had botox into masseter muscles, chin reduction, cheekbone reduction but my face and, most importantly, my head are still too large. I can lose 15 lbs at most, but I don't think it will make my face look smaller (less wide) and it will make my head look even bigger. I have heard that there are operations to decrease the size of the head, even if it's just a little bit. Is it possible? Thanks

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