Most of the white dots or stains are caused by air bubbles under the nail.
White patches called leukonychia can occur from several reasons. Usually occur due to minor injuries at the base of the nail.
They can be inherited, but in some situations may indicate medical problems.
With this appearance your nails alarm that it’s time to see a doctor. White spots on the nails may indicate on warts and fungus (onychomycosis) or psoriasis and eczema, which can affect the nails as well. White spots on the nails may be one of the seven sign of sarcoidosis, disease which affects the skin, lungs and other organs.
When the nail is soft and has white specks, it is a condition known as Plummer nail, it may refer to hyperthyroidism.
If the line is lower on the nail it means the disease is discovered at early stages.
The appearance of white horizontal lines across the surface of the nail can indicate a cardiac arrest, Hodgkin’s disease, malaria, and even leprosy.
If you notice two white horizontal narrow stripes on one or more nails, it is a sign of hypoalbuminemia, low levels of albumin protein in the blood. This disorder, and that line can cause several acute and chronic medical conditions, such as, inter alia, kidney disease, liver cirrhosis, heart failure and irregular diet. But do not worry, in most cases that line the inflammatory response to infection or injury.