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What are the purposes of the lines that are on my hands and fingers? Any know?

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The fingerprints? They improve your ability to grip things; if you're handling wet items, the fingerprints puff up to improve your grip even more. There are also some "print" lines on the palms for the same reason. The deeper lines across your palms are there to allow your skin to "fold" without discomfort when you close your hands.

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They are just wrinkles from living your life

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if you mean around the joints on the finger that's extra skin so you fingers can bend

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