Possible Clues:

• Scrape, in tot-ese
• Cut covered by a Snoopy bandage, e.g
• Sandbox injury
• Kid's cut, perhaps
• Kidspeak boo-boo
• Playground scrape
• Schoolkid's scrape
• Cut covered by a SpongeBob Band-Aid, e.g
• Draw in
• 20 Down's complaint