The long grooves in Tobias Menzies' face are actually deep vertical creases that frame his cheeks [1]. These creases are commonly referred to as smile lines, as they are believed to form due to repeated smiling or facial expressions [1]. While the exact cause of these creases can vary from person to person, they are generally a natural part of the aging process and can become more pronounced over time [1].

It's worth noting that Tobias Menzies' facial features, including these creases, are considered distinctive and interesting, adding to his overall appearance [1]. These features contribute to his rugged and elusive charm, which is often showcased in his acting roles [1].

Learn more:

1. Tobias Menzies on The Crown, Prince Philip, and Mime School
2. What causes the facial feature in this picture?
3. Outlander Anatomy on Tumblr