Hello! I read your question and understood your concern. There are different causes of indentations on the scalp. They may be caused by inflammation of the surrounding tissues, low calcium plasma levels, vitamine D deficiency or bone and meninges inflammatory or tumoral lesions. The fact that you have a progressive headache is concerning. I would recommend to consult with your GP for a good physical examination and have a blood analysis for inflammation. The calcium levels and the Vitamin D levels should be measured. I think that a brain CT scan is necessary to exclude possible lesions of the scalp and the brain layers ( meninges) like a tumor or inflammatory lesions. Hope to have been of help! Greetings! Dr. Aida