This can be caused by a genetic condition called hemochromatosis. This happens when iron starts building up in the body. It shows on the skin:
http://www.blisstree.com/tag/melasma/
There are pictures here of a woman who turned out to have hemochromatosis.
Changing skin color can be misdiagnosed as melasma in women.
(mask of pregnancy).
So I suggest you get tested for hemachromatosis...it is not that uncommon, and many doctors don't consider it. Untreated, over time it is fatal. (its occurance is about same as identical twinning).
Bronzing of the skin can occur in diabetes and adrenal disorders as well. But I would be persistent and get ruled out for hemochromatosis. Simple blood tests are all you need!
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.