Heroes and Star Wars actor Greg Grunberg has revealed that he has alopecia which he believes was triggered when he had knee replacement surgery in October.
The 58-year-old who is best known for playing Matt Parkman in Heroes and Temmin "Snap" Wexley in The Force Awakens (2015) and The Rise of Skywalker (2019) spoke about his diagnosis on the YouTube channel for his education and awareness company, Talk About It.