By Gary M. White, MD


Koilonychia is a term that means the nails are transverse and/or longitudinally concave, like a spoon. "Koilos" means spoon in Greek.

Possible Causes


The nail is concave with the plate thinned and the edges everted.


If any cause is found, it should be treated. Correcting an iron deficiency usually reverses the koilonychia. Any local skin disease should be treated. Any trauma may be reduced.


JEADV 2016;30;1985

Additional Pictures


Koilonychia in a patient with monilethrix.


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