Hello and welcome to HCM,
I understand your problem regarding headache and the dent near your eyebrow.
You must understand that you will have this dent in many simple and non worrisome condition and in all probability you have nothing to worry about.
Nevertheless in the background of your headache it will be better if you could get a CT Scan
of your nose and sinuses
and get back to me with the report as even in sinusitis
you may have the dent.
Take steam inhalation and a course of antibiotics like amoxycillin-clavulanate
625 mg twice daily for five days and see if the dent becomes better
Hope you get well soon
Dr Sriram Nathan