"Tight shoes can compress your toes, forcing the flesh into the nail," says Jenny Salazar, a nail technician in New York City. Another culprit: Nails that are too short and curved in at the corners ...

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 ...