Hello. Thanks for asking from HCM. I can understand your concern. The dent over skull can be due to : Old trauma : Bone moulding which occurred in childhood to give shape to skull : Age related degeneration like sclerosis and lysis. In your case, this may be the reason : Another cause can be bony lesion. It has been already ruled out by your doctor. But still you have doubt, you can go for MRI brain to relieve your tension. Regarding your headache, it is most probably tension headache as it is dull aching, occurring for few days. It can be confirmed by evaluating your symptoms like headache holocranial, causing band like sensation around forehead, increases in bright light/stress. To relieve it, you can follow few tips : Avoid stress both mental/physical : sleep 8 hours at least daily : Avoid bright light : while working on laptop/computer, take break after very hour : Head and neck massage : Do some fun activities : You can take painkiller like Diclofenac sodium after proper prescription Still no relief, you can consult doctor. Hope it will help you. Take care. Thanks.