Very uncommon sources of black toenails may also include: Complications caused by a black toenail are dependent on its cause. However, in most toenail injury cases, a new nail replaces the ...

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Nail biting or repeated local trauma may also cause this, especially in the toe nails due to poor footwear or over-riding toes. Of course, it could be an acquired naevus (mole) and even some ...

Living in a hot, humid climate increases the risk of developing a fungal nail infection. Health. You have an increased risk of developing a fungal nail infection if you have one or more of the ...