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Vertical nail ... Beau's line may lead to onychomadesis (fungal nail infection), according to a 2015 study. Also Read: Constant Nail Picking Is A Sign Of Anxiety, But Here Are 6 Lesser-Known ...

Save guides, add subjects and pick up where you left off with your BBC account. Straight lines can be drawn in any direction. Horizontal lines go left and right. Vertical lines go up and down.