Anakin Skywalker took his share of licks in the Star Wars saga, even before he fell to the dark side of the Force and became Darth Vader. Count Dooku claimed his right hand in their duel at the end of Star Wars: Episode II -- Attack of the Clones. But he also had a scar on his face, which he gained sometime between the end of that film and the beginning of Star Wars: Episode III -- Revenge of the Sith. Considering its prominence, and that it didn't come at the hands of Obi-Wan Kenobi like most of the rest of his scars, the question of its origins looms large.
Source：https://www.cbr.com/anakin-skywalker-scar-origin-star-wars-canon/
