Discolorations in the nail plate, be they solid white,  Fungus Hacks Review yellow, blue, brown, or black, are abnormal and represent a disease process. The most common sources of toe nail discoloration are due to keratin debris built up under the nail from natural nail thickening and aging, as well as discoloration from a fungus infection. These typically create a white, yellow, or yellow-brown discoloration. Since both of these lengthy topics have been covered by this author in other articles, the causes of darker shades of discoloration will be presented here.

Dark toenail discoloration has several causes, and properly diagnosing the cause is key to a successful treatment. The most common reason nails become darkly colored is because of bruising under the nail. Bruising is essentially blood left behind by bleeding. It can occur under the skin, and can also occur under and over the top of the skin located directly under the toenail. 

Bleeding under a toenail can be caused by dropping a heavy object onto the toe, by pressure from tight fitting shoes, by toes jamming into the end of the shoe as seen often in runners, and by stubbing injuries that cause blood vessels to burst. Spontaneous rarely if ever occurs, and often if one does not remember injuring the toe it usually means the injury was minor enough not to cause initial, memorable pain. The bruising under the nail stays in the nail plate until it grows out with the nail.

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