Well, vampire venom is presumably responsible for the regenerative healing. If foreign venom performs the usual regeneration, but does it incorrectly, then the original regenerative mechanism might not recognize that there was still damage to repair.
This suggests that a venom scar might be repaired by inflicting ordinary damage on the same spot. But there would likely be a time limit for this procedure, since the original regeneration system would update to the new shape. (If it did work this way, the time limit would almost certainly be equal to the duration of turning.)
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)