White marks on my finger.. do i have a disease??

I have this medium sized white blob looking thing under my nail.. Do I have some sorta of disease? what does it mean?.

how can i stop it?.

this is the first time I've ever had one.

Our fingernails are a window to our bodies' health. Changes in the look, shape, or color of our finger nails can indicate a disorder or a disease somewhere in our body long before other symptoms show up. For example, white fingernails can indicate that you have anemia or kidney problems. Pitted brown spots or splits fingernail tips may mean you have psoriasis.
This article will tell of some other diseases and disorders that our fingernails can warn us about so we can go see a doctor for further evaluation.
Our fingernails are made of protein, keratin and sulfur. They grow about .05 to 1.2 millimeters a week. Nail differences or abnormalities are often the outcome of nutritional deficiencies or disorders. Seek medical attention if any of the following symptoms are suspected.
White fingernails with pink near the tops are a sign of cirrhosis of the liver. Moreover, when the entire nail is white it could mean kidney or liver disorders or anemia.
White lines across the nail may also indicate liver disease. A half white nail with dark spots on the tip could indicate a kidney disorder.
Abnormally thick nails might be due to the blood not circulating properly in the vascular system.
Yellow nails can mean there are problems with your liver, diabetes, respiratory disorders or problems with the lymphatic system. Yellow nails can occur many years before the disorder shows up.
Dark nails that are flat and/ or thin are a sign of vitamin B(12) deficiency. Sometimes the nail could even be spoon shaped.
Brittle nails are a sign of iron deficiency and thyroid problems. You could have impaired kidneys or problems with circulation.
Nails that are very bendable could be a sign of rheumatoid arthritis. Pitted brown spots or split fingernail tips may mean you have psoriasis. Very deep blue nail beds can indicate pulmonary obstruction or emphysema. Nails that crack, peel and chip easily mean you need more protein and minerals in your diet. Brittle, soft nails with a shine and no moon may indicate an overactive thyroid. Nails that separate from the nail bed could also indicate a thyroid disorder. Ridges in the nail could mean an infection, or thyroid disorder. Nails that are like a bumpy road can indicate a thyroid disorder too.
Nails that resemble hammered brass indicate a tendency toward partial or total hair loss. Nail bending is a sign of rheumatoid arthritis. Flat nails can indicate Raynaud鈥檚 disease. This disease affects the circulatory system, which in turn affects the limbs. It leaves hands and feet continually cold.
Unusually wide nails that are square can mean a hormonal disorder. Red skin at the very bottom of your nail bed could indicate a connective tissue disorder. Changes in your fingernails may signify disorders somewhere else in your body, so pay close attention to your fingernails and those of your loved ones.

You are missing a vitamin. or nutrient..