5 Reasons Why Your Toenails Are Black—And When You Should See A Doctor | Life Well Lived. 5 reasons why your toenails are black-and when you should see a doctor. Running isn’t the only culprit. Many runners are familiar (read: all too familiar) with the black toenail. The condition involves bruising, blistering or bleeding beneath the nail from repetitive trauma, either of the top of the shoe banging against the nail or the toe slamming into the end of the shoe. It’s most commonly experienced by marathoners and those training at especially high intensity. Some even see it as a badge of honor: the more black nails, the more badass. But not all black toenails are from running. In certain cases, a dark nail tells a darker, more dangerous story. Here, two podiatrists explain the difference between the benign and malignant.
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