Some skin discoloration can occur with overuse of steroids, exposure to the elements/sun, thickening of skin, and aging.
Then of course there are some medical conditions that can cause skin discoloration such as thyroid dysfunction.
Here's a link to MedLinePlus, which is part of the NIH:
[url="http://search.nlm.nih.gov/medlineplus/query?DISAMBIGUATION=true&FUNCTION=searc h&PARAMETER=skin+discoloration&SHOWTOPIC S=0&x=25&y=10"]http://search.nlm.nih.gov/medlineplus/query?DISAMBIGUATION=true&FUNCTION=searc h&PARAMETER=skin+discoloration&SHOWTOPIC S=0&x=25&y=10[/url]
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