What causes fingers to be wrinkled after soaking in water?

When your fingers soak in water, the water molecules enter your skin through the pores and cause the cells to swell up. This enlargement increases the volume of your fingers and causes the skin to stretch and wrinkle. The wrinkles are more pronounced on the tips of your fingers because the skin is thinner there.

The mechanism behind the wrinkling of fingers is called osmosis, which is the process by which water molecules move from an area of low concentration to an area of high concentration through a semipermeable membrane. In this case, the semipermeable membrane is your skin. The concentration of water molecules is higher in the water than in your skin, so the water molecules move into your skin and cause it to swell up.

Wrinkling of fingers is a normal response to water exposure and does not usually cause any problems. However, if your fingers stay wrinkled for a long time, it can be a sign of a medical condition called immersion syndrome, which can cause damage to the skin and underlying tissues.