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Why do your fingers wrinkle after being in water for a while?
Fingers wrinkle in water because your autonomic nervous system actively constricts blood vessels beneath the skin, rather than the skin simply absorbing water like a sponge[1][3][5]. This process creates channels that help drain water away, acting like tire treads to improve your grip on wet objects[1][5].
It typically takes about 3.5 minutes in warm water to start wrinkling, though this varies with temperature and individual health[2]. If nerve damage is present, this wrinkling response is inhibited[2][5].
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