COLOR: Half White, Half Pink nails If your natural nails have turned two-toned (a condition called Lindsay's nails, after the doctor who first described the half-and-half nail back in 1967), get your kidneys checked out, says Steele. When the kidneys are damaged or begin to fail, waste products and fluid build up, causing swelling throughout body -- even in the nail beds. This causes the small half-moon portion of the nail just above the cuticle, called the Lunula (Latin for "little moon"), to rise and extend halfway up the nail, creating the half and half pattern.
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