If one or more of your nails appears blackened or purplish in color, this was probably due to trauma or some other type of micro-injury causing bleeding under your nail. Stubbing your toe, running long distances, wearing tight shoes, or even shoes that are too big can cause these nail changes. These types of injuries may or may not be painful. If they are severely painful, that could be an indication of a broken toe. Often these color changes improve on their own as the new nail grows out. In cases where there is excessive bleeding under the nail, the nail may loosen to the point where it falls off. If nails become darker without any noticeable injury, it could also be a symptom of B-12 deficiency, anemia, bacterial infection, or in rare cases even cancer. It is always advised to have a medical professional examine any nail changes to rule out any underlying health conditions.
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