Black toenail cases are a cause for concern to a huge number of individuals because of how terrible it looks. Aside from it how affects your nails visually, black toenail can also show underlying problems that you are unaware of. Several cases of black toenail often heal itself over time and as a result, a huge number of individuals often take them lightly or for granted. Things however, can totally go wrong with your black toenail if no immediate action is taken. Let us look at how the black toenail issue can develop from bad to worse.