"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 ...

A nail salon customer posted a viral video warning viewers about the toe infection she got while getting her nails done. She said the salon tried to pass it off as a bruise. Tasia Alexis (@tasiaalexis ...