Experts break down the causes behind your tinted fingertips—from dark nail polish to fungal infections. (QUESTIONS)

Yellow nails are where it’s at when you’re in the mood for a bright and cheery manicure—but when your digits are giving off a lemony vibe and there’s not a drop of nail polish on them, it could be your body’s way of hinting that something’s off.

“Like growth rings of a tree, marks on your nails represent changes in your health over time,” says Joshua Zeichner, MD, director of cosmetic and clinical research in the department of dermatology at Mount Sinai Hospital. “If your nails turn yellow, it may be as simple as a nail polish staining the nail plate. However, there may also be an infection or an underlying disease that’s causing them.”

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