There are several causes of<unk> . It is believed that there is a temporary cessation of cell division in the nail matrix. This may be caused by an infection or problem in the nail fold, where the nail begins to form, or it may be caused by an injury to that area. Some other reasons for these lines include trauma, coronary occlusion, hypocalcaemia, and skin disease. They may be a sign of systemic disease, or may also be caused by an illness of the body, as well as drugs used in chemotherapy, or malnutrition.<unk>  can also be seen one to two months after the onset of fever in children with Kawasaki disease. Conditions also associated with<unk>  include uncontrolled diabetes and peripheral vascular disease, as well as illnesses associated with a high fever, such as scarlet fever, measles, mumps and pneumonia.<unk>  can also be a sign of zinc deficiency. 305x305px A researcher found<unk>  in the fingernails of two of six divers following a deep saturation dive to a pressure equal to of sea water, and in six of six divers following a similar dive to . They have also been seen in Ötzi the Iceman. Human nails grow at a rate which varies with many factors: age, and the finger or toe in question as well as nutrition. However, typically in healthy populations fingernails grow at about 0.1mm/day and toenails at about 0.05mm/day.
Beau's lines
Pastia's lines
Gilula's lines
Langer's lines
Blaschko's lines
Schwalbe's line
Dandy's point
Burton's line