back of one's hand
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手の甲に小さな傷ができていた。
A small cut had formed on the back of my hand.
日焼け止めは手の甲にも塗ったほうがいい。
You should apply sunscreen to the back of your hands as well.
彼は手の甲で汗をぬぐった。
He wiped away his sweat with the back of his hand.