The skin on the fingers can become wrinkly due to water immersion, such as when swimming or bathing. However, wrinkled fingers can also indicate a medical problem, such as dehydration or diabetes.

Wrinkled skin on our fingers after long soaks in water may have made human ancestors more dexterous with aquatic tasks. In 2011, another group had proposed that wrinkled fingers act like tire treads, ...

the sympathetic nervous system triggers the blood vessels in our fingers and toes to constrict, causing skin wrinkles,” ...