Check melasma and hyperpigmentation.
Below is a link to an article on hyperpigmentation on MedLinePlus, the National Institutes of Health database. FYI, "hyper" means excessive.
[url="http://www.nlm.nih.gov/medlineplus/ency/article/003242.htm"]http://www.nlm.nih.gov/medlineplus/ency/article/003242.htm[/url]
If you're female and on hormones [birth control pill or hormone replacement therapy], pregnant or have recently given birth, melasma is another possibility. |