It is applied by a makeup artist prior to filming. In the storyline, she received the scar from healing after open heart surgery.
Katey Sagal was born on January 19, 1954, in Hollywood, California. She's perhaps best known for playing Peggy Bundy in Married with Children from 1987-1997, but is also known for her role in Sons of Anarchy as Gemma Teller, mother of Jax Teller.
Tip! Learn 7 Ways to Reduce the Appearance of Scars at Women's Health.