Spoon-shaped nails

The nails may curve inwards both along their length and width forming a depression such that they seem like spoons – spoon-shaped nails. This spooning of the nails known as koilonychia can occur in iron deficiency anemia, trauma and a variety of several other conditions.

Reference:

Fawcett RS, Linford S, Stulberg DL: Nail Abnormalities: Clues to Systemic Disease. Am Fam Physician, 2004 69(6):1417-24. Go to reference
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 Spoons

 

Image from Wikimedia Commons