White wavy lines texture on a surface

Profile: Spoon Nails (Koilonychia).

Definition: An anomaly in the shape of the nail characterised by a deformation into a concave (spoon-like) form, which is explained by an elevation of the lateral edges and a depression of the central part. Furthermore, the nail is generally thin and brittle
Internal and external causes: Genetic predisposition (autosomal dominant transmission); iron deficiency (anaemia).
How to reduce or eliminate: /
Preventative steps to take: Maintaining a balanced diet.