Let me explain: They're called leukonychia and are very common. Most of the time the white spots simply are a sign of some past injury to the matrix (base) of your nails. By the time the white spot shows up (about six weeks after the injury) you've probably forgotten all about banging or knocking your fingers.
https://www.healthtap.com/topics/white-spots-on-fingernails-deficiency
You've likely heard that these spots indicate health issues, such as calcium deficiency. “Calcium deficiency causing white spots on nails is the most common myth, followed by zinc deficiency. “Most of the time the white spots simply are a sign of some past injury to the matrix (base) of your nails.
http://ijr.com/2016/02/540768-heres-what-they-really-mean/
1 doctor agreed: White spots on nails: Maybe. Many mineral deficiencies e.g. Zinc can cause white spots on the nails. However defciencies usually will show up on most of your nails, not just the thumbnail.
https://www.healthtap.com/topics/white-spots-on-fingernails-deficiency
The visual appearance of the fingernails and toenails may suggest an underlying systemic disease. Clubbing of the nails often suggests pulmonary disease or inflammatory bowel disease. Koilonychia, or “spoon-shaped” nails, may stimulate a work-up for hemochromatosis or anemia.
http://www.aafp.org/afp/2004/0315/p1417.html
A 1964 study5 described “yellow nail syndrome,” in which nails grow more slowly and develop a “heaped-up” or thickened appearance. The lateral sides of the nail plate show exaggerated convexity, the lunula (i.e., the white half-moon at the proximal edge of the nail bed) disappears, and the nail takes on a yellow hue.
http://www.aafp.org/afp/2004/0315/p1417.html
– February 11, 2005. The white spots on nail you notice are not caused by a calcium deficiency. These white spots in fingernails are called “leukonychia” and are very common. Most of the time the white spots simply are a sign of some past injury to the matrix (base) of your nails.
https://www.drweil.com/health-wellness/balanced-living/healthy-living/worried-about-white-spots-on-fingernails/
Check out this list of deficiency symptoms to see if you are lacking in some nutrients. Eye, hair, nail, mouth and skin symptoms are among the early outward warning signs of vitamin and mineral deficiencies. The following compilations may help in diagnosing and treating these deficiencies.
http://www.health-science-spirit.com/deficiency.html
Check out this list of deficiency symptoms to see if you are lacking in some nutrients. DEFICIENCY SYMPTOMS. By Walter Last. Eye, hair, nail, mouth and skin symptoms are among the early outward warning signs of vitamin and mineral deficiencies. The following compilations may help in diagnosing and treating these deficiencies.
http://www.health-science-spirit.com/deficiency.html
Children and active adults commonly have one or more white lines or spots on one or more nails; this condition is known as leukonychia (Figure 7). These lines and spots are nonuniform, appear in different places on different nails, do not span the nail, and are of no significance.
http://www.aafp.org/afp/2004/0315/p1417.html
You've likely heard that these spots indicate health issues, such as calcium deficiency. But as Dr. Jessica Krant, a board-certified dermatologist in New York City, tells Huffington Post that's not true: “Calcium deficiency causing white spots on nails is the most common myth, followed by zinc deficiency. The truth is that white spots are common and harmless and don't indicate any specific vitamin deficiency at all.”.
http://ijr.com/2016/02/540768-heres-what-they-really-mean/
what deficiency produces white spot on nails
Calcium deficiency produces white spot on nails. The deficiency of calcium can produces white spot on nails.