A birthmark, scar, subcutaneous pigmentation, magical tattoo, or otherwise permanent/semi-permanent mark on a character that somehow ends up being significant to the plot BY A CHANGE IN IT or something unusual that it does; it can't just be static. Disappearance of the mark, the stoppage of its unusual function, or a discovery that the mark was never real is part of this trope. Normal healing of a wound to a scar does not count; a wound that does not heal due to magic or poison may, as long is it does more than just not heal (i.e., bleeds excessively when the inflicter of the wound is near, etc.). Subtrope of Distinguishing Mark. With examples, please include the noteworthy change in the mark.