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