Question

Why are fingers shrink, (in water) when water enters our skin

Answer 1

when submerged in water long enough, the sebum of skin washes off and the keratinized outer layer of skin absorbs water, becoming relatively swollen compared to the tissue underneath and causing the skin to become wrinkled to compensate for the added surface area.

Answer 2

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When the hand is soaked in water, the nerve fiber in the skin shrinks and the body temperature regulator (glomus bodies in the skin) in the hand loses its volume. Thus the epidermis of the skin is pulled downward, forming wrinkles. At present, the role of digital vasoconstriction is under investigation