On the 31st of October 1981 when he was attacked by Lord Voldemort when he was a one year old baby.
Harry's lightning scar is located on his forehead.
Harry Potter and the Philosephers Stone
Harry's scar is red.
No. Harry says his scar hadn't pained him for nineteen years, which he when he killed Voldemort.
No, he always has his scar. There are no goofs documented where this was missing since it's such a important part to the character of Harry Potter.
Dumbledore.
Harry Potter. This was a result of a failed attempt at his life by Voldemort.
Yes.
Yes.
It didn't. In the book said last time Harry's scar hurt was 19 years ago, when Voldemort died. In the movie, you have nothing that indicates that his scar was hurting.
It identifies him as the boy who lived.
He got it when he was an infant, by Lord Voldemort, when Lord Voldemort killed harry Potter's parents and tried to kill Harry potter but couldn't. Only left a scar on his forehead. Watch the movie.