it continues to worsen.
You should be especially cautious about a new dark streak, a changing mark, bleeding, pain, swelling, or a nail that begins to separate from the surrounding tissue.
A dermatologist can examine the nail closely and determine whether further testing is necessary.
The important point is not to panic—but also not to ignore a significant change simply because it appears on a fingernail.
The Bottom Line
Lines on your nails are common, especially as you get older, and most nail ridges are not a sign of
a
