The researchers, whose findings are published in the experimental-biology publication FASEB Journal, analyzed 2,411 people with vitiligo.
By looking at people with two different kinds of vitiligo -- strictly segmental vitiligo (SSV) and non-segmental vitiligo (NSV) -- they discovered that both kinds resulted from oxidative stress.
And by applying a topical treatment, a substance called PC-KUS, the researchers successfully treated the discolored skin and eyelashes of people with vitiligo.
Though gray hair isn't always a welcome sign of aging, some evidence suggests it can be an indicator of good health.
Researchers in 2012 found that wild boars with significant graying hair "were actually those in prime condition and with the lowest levels of oxidative damage," researcher Ismael Galván of the Museo Nacional de Ciencias Naturales in Spain said in a statement.
"Far from being a sign of age-related decline, hair graying seems to indicate good condition in wild boars," Galván said.
Nonetheless, many people will go to extreme lengths to hide any hint of aging, including gray hair.