As simple an issue as yellow nails may seem, it can be tough for even experts to pinpoint the cause. "Every time somebody comes in with a nail change, I put on my super-sleuth hat," Dr. Kristen Lo ...

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The four little words that make the world spin, 'I need a manicure!' never ring quite as true as when you glance down at your fingernails and notice that all of the sudden they’re tinged yellow. Eek!