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Longitudinal (very light/greyish brown) band on big toe nail.

I recently discovered (about 4 months ago) a faint greyish brown line on my wife's toe nail. Does anyone know what this might be?

Please see the picture: https://drive.google.com/open?id=1Iz0WFFvvEK6gcqBvg76SbuslF88yt3K_
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