Theory:Peter's scar

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The following fan theories are about Peter's scar.

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Theories

Theory	Citations	Notes
Peter will get the scar from Hiro.	None	- Future Hiro tells present-day Hiro that he tried to kill Sylar, but the wound regenerated. + Peter's scar is the shape of a line, just the shape a sword slash would leave. - Peter is not Sylar.
Peter will get the scar in the presence of the Haitian.	None.	+ The Haitian can suppress at least some powers, so if Peter was wounded in his presence and the scar formed, cell regeneration would not heal an existing scar. - The Haitian's power dampening is not absolute as Nathan was able to fly away in his presence. However, Nathan flying away was unexpected as before flying he looked as if he was going to tackle HRG and the Hatian. This would have suprised the Haitian, and maybe his power dampening requires some deal of concious effort. By the time he thought to use his power, Nathan could have flown out of the Hatian's range. - The Haitian appears to only be able to block mental powers, such as mind-reading and telekinesis. • The Haitian was able to block Hiro's and Daphne's powers, and their powers are not mental. • Did the injuries he received in the presence of the Hatian during Future Claire's torturing heal afterwards? • Could be because Nathan's ability is synthetic, so the blocking won't work as well.
Peter's scar is the mirror image of a scar Linderman has.	None.	+ Linderman has a faint scar that is most visible when pausing episodes, most notably .07%. - The scar mirror images could be irrelevant, as the scar could be actor Malcolm McDowell's and not the character's. • Peter might not get the scar at all, as history has been changed.
An as-yet unseen character has an ability which can permanently disfigure people who can regenerate.	None.	• Currently there is no way for Peter to get a scar. + Angela's vision shows Knox easily ripping Claire's head off. Perhaps he is powerful enough to cause permanent damage to heroes with rapid cell regeneration.
An object being lodged in his face while he healed will cause the scar.	None.	+ If something prevents the skin from closing as it normally would, it may start to heal around the obstruction (much like pierced ears heal around an earring). - However, he can have cellular regeneration. This could mean that every cell "missing" from it's orginal place is re-made and put back in the proper place, therfore there would be no scar. For example, in .07%, when the share of glass is taken out of his brain, the brain fully heals, so surely the scar would have disappeared.
The reason why Peter still has the scar, even if he has the cheerleader's ablity, is an emotional reason. What ever the reason is, it seems to have blocked the healing of this scar tissue.	None.	+ In the Dark Future, Peter seems to take on any request Hiro asks because of his guilt of the explosion, after 5 years Peter has not been able to forgive himself and seems to be guided by the emotions of guilt. + Within the real world there have been cases where people unable to heal from a wound because of emotional reasons or to have causd damage to their bodies because of an emotional reasons such as broken heart syndrome.
Peter's getting a scar is an inevitable event in any timeline.	Writers Joe Pokaski and Aron Coleite said about Peter's scar, "First, it is not a mistake, Peter can regenerate, but he still has the scar. Secondly, we'll show you how later on in the series. We promise."	+ Future Peter as seen in The Second Coming and The Butterfly Effect has the scar, despite having saved New York City.
Peter, in the orginal dark future gains the scar before meeting Claire. Then, after he gains the regeneration ability, he gets the scar during some experiment once the heroes are announced to the general public.	During the alternate future at the start of season 3, Peter explicitly states that evolved humans were experimented on.	+ Peter could not scar as is, because his ability to regenerate would heal any wound, including removing the scars. This is shown when Sylar tries to take his power but leaves no scar on his forehead. It is possible, however, that at some point in the alternate future, Peter would be taken for experimentation and injected with something to cancel his powers, either temporarily or until they reverse it and give him his powers. In this case, his ability to regenerate would be gone and in an attempt to prove it, he is cut across his face by the person who is conducting the experiment. It may be symbolic in the future, as a way for the government (or whoever was doing the experimenting) to show other evolved humans that their powers can be taken from them. • When Peter agrees to stay with the Company, after nearly killing Nathan, he takes pills that cancel his powers. This is just evidence that something could be created to remove, cancel, or at least suspend powers.
Peter could heal the scar if he wanted to, but chooses not to.	None	+ Future Peter has shown the ability to heal. - Rapid cell regeneration is a passive ability, which means that it'll activate with or without intention. • This seems to be true for "true" healers like Claire or Sylar, but Peter has to think about the power to use it. This is why he is shot in the stomach and killed. He may have developed the power as to be able to heal certain areas but not others. - He obviously wasn't thinking about it when he was killed with that shard of glass in volume one. He obviously wasn't thinking about it when he lost his memory at the beginning of volume two. Claude has already taught him to make it a passive ability. He doesn't need to think about it. And being able to heal only specific areas does not fit with what we've seen of rapid cell regeneration so far.
After his father stole Peter's powers, Peter was somehow slashed across the face and was unable to regenerate, causing his scar to stay permanently.	None.	+ Peter no longer has his powers.(Dying of the Light) + A promo for Eris Quod Sum showed Peter with a wound across his cheek, which was not healed. It can be reasonably deduced that a wound across his face would not heal either.