Shift your free hand to the top of your belly and slide it down the side to feel for the baby's back. If that side is smooth and has even resistance to pressure, that's the back. If you can press in further, it's uneven and you feel a lot of movement, that's the front of the baby.
An injury â Bruising or a collection of blood under the toenail can cause the nail to appear dark with black, blue and purple shades of color. Often called âRunnerâs toeâ itâs caused by an injury or trauma to the toe. Cancer â A scary thought but it is a very rare condition. Cancer occurring in the nail bed and the surrounding area will show up as dark, tan and or black spots underneath your toenails or fingernails.
Other common things that can cause toenail fungus include: 1  Improper footwear, especially tight-fitting shoes. 2  Medical conditions such as diabetes and other circulatory conditions. 3  Toenail polish that is applied in layers. 4  Hosiery, socks, and shoes that do not allow the feet to breathe.