After several minutes, tiny blood vessels in the fingertips constrict, pulling the skin inward and creating wrinkles. This biological response may help improve grip on wet or slippery objects.
Researchers believe this reaction may have provided an evolutionary advantage by helping humans handle objects and move more safely in wet environments.
In most cases, the wrinkles are harmless and disappear after the hands dry. However, unusually fast or persistent wrinkling can sometimes be associated with certain medical conditions or medications.
