These include:
A new dark streak under one nail
A dark area that becomes wider or changes
Bleeding without an obvious injury
Persistent pain or swelling around a nail
The nail separating from the nail bed
Significant nail destruction
Rapidly changing pigmentation
A persistent unexplained growth around the nail
A new or changing dark streak can occasionally be associated with melanoma of the nail unit, although there are many benign causes of nail pigmentation as well.
That is one reason a changing dark streak deserves professional assessment rather than internet diagnosis.
Can Nutritional Deficiencies Cause Nail Changes?
Nutrition can influence nail health.
Severe deficiencies or inadequate nutritional intake may contribute to brittle, thin, or otherwise abnormal nails.
Iron deficiency, for example, can be associated with certain nail changes.
However, you shouldn’t automatically start taking high-dose vitamins simply because you notice a nail line.
Taking unnecessary supplements can sometimes cause harm, and many nail changes have nothing to do with nutritional deficiency.
