Daniela Ruah has been on 'NCIS: Los Angeles' since 2009. The actress has an eye condition some don't know about. Here's 1 thing he wants you to know.

WATCH: NCIS: LA's Daniela Ruah shares worrying medical history However, she later explained to Esquire: "It's a birthmark called nevus of Ota. It covers the whole white of my eye and darkens it.

Daniela Ruah sizzles on “NCIS: Los Angeles,” and now the actress is turning up the heat for the September issue of Esquire.”I’m a woman and I enjoy feeling sexy once in a wh… ...

Fans of "NCIS: Los Angeles" might notice something unique about Daniela's gaze - her right eye is completely dark. "It's a birthmark called nevus of Ota," Daniela explained.

NCIS: Los Angeles star Daniela Ruah's rare eye condition explained She then wrote in her caption: "A few days ago, we said goodbye to our sweet pup, Roxy.