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Sebum: An oily secretion of the sebaceous glands.
Waterlogged: Saturated with or full of water.
Epidermis: The outer layer of cells covering an organism, in particular.

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s, 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. So how does this lead to wrinkles? For a long time, people thought the water caused skin to swell up and get puffy. Now researchers believe wrinkly fingers could be a nervous system reaction. Why? Because it's easier to pick up wet objects with wrinkly fingers. What should you do if this happens to you? Nothing. It goes away quickly on its own. You'll have more sebum on your skin in no time. http://kidshealth.org/en/kids/wrinkly-fingers.html 

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What should you do if this happens to you? Nothing. It goes away quickly on its own. You'll have more sebum on your skin in no time.

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Even though you can't see it, 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.

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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. So how does this lead to wrinkles? 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. Why? 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 tire.

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Have you ever stayed in a pool or bathtub so long that your fingers got wrinkly? This is normal — and can even affect your toes. But why does it happen?

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Do your fingers get wrinkly in salt water?
In salt water the salt inside the water is greater than the salt in your body, so the salt moves out of your body and into the water not letting your fingers wrinkle. In fresh water your fingers wrinkle because the water moves in to your finger causing the wrinkles to occur.

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why do my fingers get wrinkly in water so fast?
Once the oil is gone, the water begins to adsorb its way into the outer layer of your skin. When you have wrinkly bath fingers, your fingertips are actually waterlogged, which means they are completely saturated with water. As the epidermis begins to swell, it pulls on live skin layers beneath.

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Wrinkles are caused by blood vessels below the skin and when your hands and feet wrinkle it can get a better grip on something wet or submerged in the water like the rain treads in a car tires. https://www.scientificamerican.com/article/why-do-our-fingers-and-toes-wrinkle-during-a-bath/

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When you have wrinkly bath fingers, your fingertips are actually waterlogged, which means they are completely saturated with water. As the epidermis begins to swell, it pulls on live skin layers beneath. Unlike the dead surface layer, deeper layers are firmly attached to fibers in your skin and do not swell. The swelling of outer layers and pulling in of deeper layers is what causes the appearance of wrinkles after you've spent some time in the tub.

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The thicker layer of skin on your hands and feet contains more dead skin cells than other parts of your body. These dead skin cells soak up water like an efficient sponge, while thinner skin on the rest of your body is less affected.

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How long does it take to get your fingers wrinkly?

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How long does it take to get your fingers wrinkly?

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The amount of time it takes for the skin to wrinkle in water varies from person to person. In general, if you spend longer than 10 minutes in the water, your skin is likely to start wrinkling. (https://www.modernmom.com/2df6f7ae-051f-11e2-9d62-404062497d7e.html)

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Although you cannot see them, your skin is covered with special oils. These oils lubricate and protect your skin. They also act like a raincoat, making your skin a bit waterproof. This is why water rolls off your hands when you wash them before dinner.

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Kate Evans/ Why do your fingers wrinkle when they are wet?

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Kate Evans/ Why do your fingers wrinkle when they are wet?

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Even though you can't see it, 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. So how does this lead to wrinkles? For a long time, people thought the water caused skin to swell up and get puffy. Now researchers believe wrinkly fingers could be a nervous system reaction. Why? Because it's easier to pick up wet objects with wrinkly fingers. What should you do if this happens to you? Nothing. It goes away quickly on its own. You'll have more sebum on your skin in no time. http://kidshealth.org/en/kids/wrinkly-fingers.html

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How come your fingers wrinkle up when your in water?

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How come your fingers wrinkle up when your in water?

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The outside layer of your skin, or the epidermis, contains a coating of sebum, an oily substance that keeps water out of your skin.you’re in water for a while, the layer of sebum washes away and your skin begins to take in the water. This absorption causes the skin to swell. you’re in water for a while, the layer of sebum washes away and your skin begins to take in the water. This absorption causes the skin to swell. (https://www.modernmom.com/2df6f7ae-051f-11e2-9d62-404062497d7e.html)