Nail Changes That May Signal Rare Nail-Unit Melanoma

Doctors may look at your nails when checking your health.

Dark lines on nails often have harmless causes.

But a new dark line on just one nail can be concerning.

It is more important to have it checked if the line gets wider.

Uneven colors or irregular edges are also warning signs.

The line may also spread onto the skin around the nail.

A rare cancer called nail-unit melanoma can cause these changes.

It may not hurt, so nail changes that last or worsen should be examined by a doctor.