3.Dark Lines Beneath the Nail
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Dark lines under nails can result from trauma, such as pinching your finger, causing bleeding beneath the nail. However, if no injury has occurred, these lines could indicate a serious condition like skin cancer. Known as melanonychia, dark streaks are particularly concerning if they appear on a single nail. While some lines are harmless and linked to medications, pregnancy, or ethnicity, any new or changing line should be evaluated by a doctor. Subungual melanoma, a rare but serious type of skin cancer, is a critical concern. Early detection is essential, so any unexplained dark streak, especially one that widens or darkens, should prompt immediate medical attention.
