when it is:
New, persistent, unexplained, rapidly changing, or accompanied by other symptoms.
For example, you may want to seek medical advice if several nails suddenly develop unusual grooves or discoloration and you have also experienced significant illness, unexplained weight loss, persistent fatigue, or other changes in your health.
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You should also have persistent nail changes evaluated if you cannot identify an obvious cause.
What If Only One Nail Is Affected?
When a change appears on just one nail, local causes become particularly important to consider.
Repeated
