Complications caused by a black toenail are dependent on its cause. However, in most toenail injury cases, a new nail replaces the discolored and damaged nail over several months. In this case ...

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 ...

I have a question - Can Raynaud’s syndrome cause nails to turn black? Ed’s note: This question comes from a reader in response to the December 28 article, ‘My child’s toe nails have turned ...