liver, and other systemic conditions. In some people, it can also be inherited and harmless.
What to do: New or unexplained clubbing should be evaluated by a healthcare professional, particularly if it develops alongside symptoms such as shortness of breath, persistent cough, or unexplained weight loss.
7. Dark Lines Under a Nail: When to Get Them Checked
What it looks like: A brown or black vertical band running from the base toward the tip of the nail.
What it might mean: Dark nail streaks, known as longitudinal melanonychia, can have
