6. Clubbing: Sign of Low Oxygen Levels
What it looks like: Enlarged fingertips with nails that curve downward.
What it might mean: Often linked to low oxygen levels due to lung, heart, liver, or digestive disorders.
What to do: Seek medical attention promptly, as this can signal serious underlying conditions.
7. Dark Lines Under the Nail: Possible Melanoma
What it looks like: A dark brown or black vertical stripe under the nail.
What it might mean: While sometimes harmless, sudden or irregular lines could indicate a rare form of skin cancer.
What to do: Do not ignore new or changing lines—consult a dermatologist immediately.