What makes your hands wrinkly after you shower or take bath for long time?

When you soak in water for an extended period, the outer layer of your skin absorbs water and swells, causing the skin to wrinkle. This reaction is believed to be a response from the body to enhance grip on wet surfaces, as the wrinkles create more friction. The process is controlled by the autonomic nervous system, which constricts the blood vessels under the skin, leading to the wrinkled appearance. Once you dry off, the skin returns to its normal state as it loses the absorbed moisture.