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!

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Thick, yellow, and brittle toenails are often caused by fungal infections like onychomycosis, which thrives in moist environments and on keratin. Risk factors include diabetes, poor circulation, and ...