Possible Clues:

• Stubbed piggy toe, e.g
• Playground injury
• Boo-boo, in kidspeak
• Minor injury?
• Scrape, in totspeak
• Sandbox boo-boo
• It's under a toddler's Band-Aid
• Scrape in the sandbox
• Boo-boo, to a tot
• Skinned knee, say, to a tot