Nail pits are visible depressions on the surface of your nail. When the superficial layers of your nail plate develop defectively, nail pitting occurs. However, nail pitting can also be a sign of something more serious such as malnutrition, psoriasis, a respiratory disease or connective tissue disorders.*

A trauma to an individual nail bed can localize pitting to a single nail. Usually when a more serious health implication is in play, you’ll notice nail pits on multiple nails, in which case you should follow up with your doctor as soon as possible.

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*http://www.medicinenet.com/nail_pitting/symptoms.htm
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