Question

Why do our hands get shriwlled up when we are in water for a long time (This happens while swimming also not just while in impure water )

Answer 1

It is due to spontaneous reflex evolved to improve ourhandling of wet objects. Your skin is covered with its own special oil called sebum (say: SEE-bum). Sebum is found on the outermost layer of skin. Sebum moistens, or lubricates (say: LOO-bruh-kates), and protects your skin. It also makes your skin a bit waterproof. That's why water runs off your skin when you wash your hands, instead of soaking it in like a sponge would.

But staying in water for a long time washes away the sebum. Then, the water can penetrate the outer layer of your skin. This causes your skin to become waterlogged. For a long time, people thought the water caused skin to swell up and get puffy. Now researchers believe wrinkly fingers could be an autonomic nervous system reaction.Because it's easier to pick up wet objects with wrinkly fingers. Wrinkles on your fingers may give you more grip, kind of like treads on a car tyre.
It goes away quickly on its own. You'll have more sebum on your skin in no time.