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Thanks for your question. The health of our toes can often be an indicator of our overall health. Here's a link to information about nail diseases, as well as pictures, that will help you figure out what's going on. http://www.nlm.nih.gov/medlineplus/naildiseases.html

According to the American Podiatric Medical Association, a toenail fungus is usually a dark color and sometimes results in a foul smell. You can learn more about fungal infections here: http://www.apma.org/MainMenu/Foot-Health/FootHealthBrochures/GeneralFootHealthBrochures/NailProblems.aspx