It is harmless and most commonly caused by minor injuries, such as nail biting, which occur while the nail is growing.<unk>  occurs most commonly in healthy individuals, and is unrelated to any known nutritional or physiological deficiency. When caused by injury the marks will disappear as the nail grows outwards. While there are various sources that link dietary needs or vitamin deficiency with recurrent<unk> , this notion has been challenged by some medical researchers. Other possible reasons for this problem with nail colour can be linked to: * Arsenic poisoning * Lead poisoning *Particularly large white spot.Pneumonia * Heart disease * Kidney failure * Ill health * Hypoalbuminemia * Vitamin deficiency * Ulcerative colitis * Liver cirrhosis * Psychogenic stresses * Onychophagia * Trauma injury * Occupational trauma * Zinc deficiency * Protein deficiency * Psoriasis * Eczema *Iron deficiency
Leukonychia
Melanonychia
Paronychia
Chromonychia
Platonychia
Anonychia
Trachonychia
Hapalonychia