Also called: Koilonychia · Dished nails

Where on the hand: On the nail plate, seen in side profile.

What it looks like: Dips in the centre — concave enough that it would hold a drop of water.

Traditionally read as iron deficiency, energy depletion and nutritional deficiency.

Read with care: Another point where traditional reading overlaps a real clinical sign. Report the tradition, and direct any actual concern to a clinician.