Dark Spots in Eye and Skin

I must admit, being a physician, I notice unusual skin changes where
ever I go and I'm fascinated with the variety of conditions I see.
Thanks to the Captain of our snorkeling trip in Hawaii for allowing
these photos of his congenital condition called Nevus of Ota.
(Originally described by Ota and Tanino in 1939). As you can see, there
is a gray or blueish patch on the skin around the eye