Many people dismiss nail discoloration as harmless, but experts warn that a dark streak on a toenail could be a sign of a rare but aggressive form of cancer that can turn fatal without early ... The ... When Maria Delgado noticed a dark streak under her big toenail, she assumed it was from dropping her gym bag on her foot.

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Six months later, that seemingly innocent mark led to a diagnosis that saved ... MSN: 9 Things That Can Cause a Black Toenail and Treatments That Help Black toenails are usually the result of toenail injury. However, there are other things that can cause a black toenail, including fungal or bacterial infections. Most cases of black toenails aren’t ...

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9 Things That Can Cause a Black Toenail and Treatments That Help Newsner on MSN: Expert warns anyone with discoloured toenail should see doctor straight away Toenail fungus usually is caused by a microscopic organism called dermatophyte fungus. It often begins as a white or yellow spot under the tip of your toenail. But as the infection goes deeper, nail fungus may cause your nail to discolor, thicken and crumble at the edge. Mayo Clinic Q and A: Treatment for toenail fungus isn't always ...