I, too, have a dent in the top front part of my head that I first noticed a few months ago. I am a 44-year-old female. I have not had headaches, hair loss or any sensitivity. It is just noticeable when I comb my hair. I do wear my sunglasses on my head often - way too often! I have always had issues related to calcium in my body (kidney stones
& bad teeth that break easily). I've never really been tested - something that I should do now that I know. Thanks for all the posts.