However, some nail changes “are more closely associated with either an acute systemic illness or chronic systemic illnesses of some kind,” says Stringer. Beau’s lines are transverse grooves ...

Patient otherwise had normal teeth, hair, and skin. On exam of the nails, multiple transverse white curvilinear bands were noted. The bands were separated by normal pink nail color (Figure 1).

A black line on the nail could be normal, such as when it is just a color variation. Other possible causes range from injury to certain medications for conditions like human immunodeficiency virus ...

Fingernails and toenails grow slowly, so it may take some time for the white spots or lines to disappear entirely. Fingernails typically take 6 months or more to grow out fully. Toenails can take ...