Hemochromatosis is an hereditary iron overload problem. "Bronzing" of the skin is one of the symptoms. Other symptoms kind of mirror a variety of autoimmune disorders, so it's another sneaky and easily missed diagnosis. The excess iron can result in a wide range of problems over time, including arthritis, fatigue, liver disease and many other serious conditions and problems. If discovered, the treatment is straightforward and further damage is halted. It is genetic - with higher occurence in those of Euro/Celtic ancestry.
I have no idea if the "bronzing" of the skin would relate at all to the specific color and pattern you describe. If you Google Hemochromatosis, you will find lots of info on it. I'm beginning to think all of us with rheumatic conditions ought to be screened for it - which is easily enough done, just isn't done routinely.