By the way, doctor: Why does skin wrinkle after being underwater?
Some people think that the wrinkles occur because of osmosis — water flowing out from the skin into a less "salty" environment. This mistakenly suggests that the wrinkles from the bath are like the tiny depressions and folds of dry skin. In reality, bathtub wrinkles are raised areas of skin puffed up by water absorption. One explanation that's been offered for pruny skin is that the absorbed water affects nerves, which leads to constricted blood vessels that pull the skin downward, creating furrows.
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