“… - Petrol, solvents, engine oils (mechanics, cabinet‐makers, homemakers, railway workers, oil‐burner repairers)
- Acids, alkalis (cement workers/ brick‐layers), thioglycolate (hairdressers), sulphur and arsenic (chemical hair removal products)
- Mechanical trauma (rickshaw boys, butchers, mushroom growers, coil winders, slaughterhouse workers, pin threaders)
- Thermal burns
- Nail biting, thumb/finger sucking, poorly fitting shoes
- High altitude ‘Ladakhi koilonychia’
- Avitaminosis/Nutritional
- Nutrients
- Protein deficiency/low albumin
- Vitamin C
- Vitamin B12
- Niacin, zinc, copper
- Sulphur‐containing amino acids: methionine, cystine
- Populations
- Kidney transplantation, End stage renal disease
- Alcoholism
- Poor nutrition, cachexia
- Post‐gastrectomy
…”