A BIG THANKS for the information Blast (says the now barefoot man at his computer). I have now just discovered 2 marks on my left foot that meet 2 of the points you listed. I have a doctors appointment soon for my lingering concussion symptoms and I will have him check my foot "marks" then.

I spent a lot of time outdoors and my kids tease me about the permanant brown line across my forehead where my hat ends.

Hope all is well with you Blast and terrific that you caught this at such an early stage. What made you check out your feet in the first place?

Thanks again, MIKE