question: I have just noticed a long indentation in my skull on the top about a quarter to half inch wide and about six inches long. I am diagnosed with Sjogrens and distal tubular renal acidosis. Lately my skin and hair has been very dry. Iam not sure if the indentation is related and can find very little information. Is this serious. It has become sensitive to touch and I also had a recent TIA and could not pinpoint the cause. Is any of this related. What could cause this indentation?