Related Clues:

• Slash mark
• Tide target
• Fight memento, perhaps
• Line from an operation
• Crook's mark, maybe
• Old punch line?
• Criminal's identifying trait, maybe
• Skin blemish
• Fight souvenir
• Wound mark
• Frankenstein monster feature
• Capone's distinguishing mark
• Memento of a knife fight
• Harry Potter has a lightning-bolt-shaped one on his forehead
• Dry cleaner's challenge