Hello!
Thank you for your question on HCM! I understand your concern. 
Indentations in the head may be caused by different types of disorders affecting the soft tissues, the bones of the skull or the 
meninges ( brain layers). The cause may be a 
tumor, inflammation or infection. 
Sometimes vitamin D deficiency and low plasma levels of calcium have been associated with indentation from bone changes. 
I would recommend you to consult with your GP, have a careful physical examination, a scull xray, routine 
blood test, vitamin D and calcium plasma levels, Lactate dehydrogenase. 
A brain 
CT scan may be needed to examine the anatomy of the lesion better. 
Hope to have been helpful!
Greetings! Dr. Aida