Beau’s Lines

Transverse depression/line/furrow in nail plate – no discolouration. Due to sudden arrest of nail growth, generally due to trauma or systemic condition (with a febrile illness). Multiple incidents/events  multiple Beau’s lines. Appear proximally and grow out  nail growth is 3 months in young adult and 4 months in older person  can approximately date episode of illness/trauma

Been reported as associated with severe dysmenorrhoea, arsenic poisoning, eczema, diabetes mellitus.