5 Serious Health Problems Your Nails Could Be Trying to Warn You About

4. Dark Lines Under the Nail – Possible Melanoma

5 Serious Health Problems Your Nails Could Be Trying to Warn You About
4. Dark Lines Under the Nail – Possible Melanoma
A dark stripe or line running vertically under the nail should never be ignored. This can be a sign of subungual melanoma, a rare but dangerous type of skin cancer. If you notice dark stripes—especially if they widen or change—see a doctor immediately.

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