If they get injured by a human, it would have almost no effect and will heal very quickly. If it's from a nation, it will scar without fail.
[A/N: if you guys want to request a headcanon/s or you want a headcanon from a specific nation, then feel free to comment or PM me!]
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Hetalia Headcanons [COMPLETE]
RandomThis just includes headcanons on the show (duh), which I honestly didn't expect would become popular. If you want to request, comment. If ya have a submission, PM me. Enjoy! EDIT: PART TWO IS OUT