A healthy nail (with healthy skin beneath its bed) has a pretty, pinkish hue. When it doesn't that may be a reason to worry. "When all of the nails turn yellow it can be a sign of lung disease or diabetes," says Dr. Arielle Kauvar, a New York City dermatologist. "Yellow spots on the nails can be an indicator of fungus or psoriasis. "Since any of these conditions warrants treatment by a doctor, it's worth seeing a dermatologist by a doctor, it's worth seeing a dermatologist if yellow nails persist.
Women who frequently wear very dark nail polish for long periods of time (especially without using protective basecoat underneath it) may also notice a slight yellowing of their nails, but it's no reason to panic. The nails are merely stained from the polish and will return to their normal shade if they are left unpolished for a while.
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