Koilonychia is dystrophy of the fingernails in which they are thinned and concave with raised edges.
Koilonychia is also described as 'spoon shaped nails' and has the ability to retain a drop of water. The condition is often seen in fingernails and rarely in toenails (1).
This condition may be caused by
- iron deficiency - most common cause
- direct trauma e.g. due to use of vibrating tools.
- regular contact of hand to petroleum based solvents
- nail patella syndrome
- haemachromatosis – occasionally
- may be a normal nail variant in infants – generally disappear within the first few years in life (1)
Last reviewed 01/2018