When Maria Delgado noticed a dark streak under her big toenail, she assumed it was from dropping her gym bag on her foot. Six months later, that seemingly innocent mark led to a diagnosis that saved ...

An ingrown toenail—medically known as onychocryptosis—refers to a toenail that has grown into your skin. The top corner of the nail grows into the flesh, causing pain and inflammation. Most ingrown ...

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 ...