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American Focus > Blog > Tech and Science > Mystery About The Way Fingers Wrinkle in Water Might Have an Answer : ScienceAlert
Tech and Science

Mystery About The Way Fingers Wrinkle in Water Might Have an Answer : ScienceAlert

Last updated: May 14, 2025 12:15 am
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Mystery About The Way Fingers Wrinkle in Water Might Have an Answer : ScienceAlert
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Unraveling the Mystery of Finger Wrinkles: A Closer Look

After discovering the blood vessels responsible for the formation of wrinkly fingers after a long bath or swim, young readers of The Conversation’s Curious Kids series posed intriguing questions to scientists.

One curious reader asked, “Do the wrinkles always form in the same way?” This question stumped biomedical engineer Guy German from Binghamton University in New York, prompting him to embark on a research journey to find answers.

German, alongside his colleague Rachel Laytin, conducted an experiment with three volunteers who soaked their fingers for 30 minutes. The results revealed that the patterns of looped peaks and valleys on the participants’ wet fingertips mostly repeated themselves when soaked again 24 hours later.


Lines trace the same wrinkles (black) and different wrinkles (red) on a volunteer’s ring finger, after soaking on two different days. (Laytin & German, J Mech Behav Biomed Mater, 2025)

As water penetrates through sweat ducts into the skin, it reduces the salt concentration in the outer layer, triggering nerve fibers to alert the brain. This signal prompts the automatic retraction of blood vessels, causing the skin to wrinkle.

German explains, “Blood vessels don’t change their position much, so the wrinkles should form in the same manner, and we proved that they do.”

An image of a smooth finger tip and then two similar water wrinkled fingers
The changes observed in one of the volunteer’s finger tips across the experiment. (Laytin & German, J Mech Behav Biomed Mater, 2025)

These wrinkled textures provide a better grip in wet conditions, enhancing our ability to walk on slippery surfaces or grasp objects more securely. However, the reason why we don’t retain these wrinkles permanently remains a mystery.

Research has shown that swelling alone does not cause finger wrinkling, and individuals with nerve damage do not experience this phenomenon. This revelation has opened new avenues for investigating the underlying mechanisms.

See also  Enigmacursor mollyborthwickae: Small and speedy dinosaur recognised as a new species

German highlights the potential forensic applications of understanding finger skin distortion, particularly in identifying bodies after prolonged water exposure during natural disasters.

By uncovering the consistent patterns of wrinkle topology in our skin, alongside fingerprints and hidden stripes, we gain a deeper understanding of our body’s fascinating physiology.

Your Fingers Wrinkle The Same Way Each Time They're Soaked
Lines of Blaschko are another example of consistent patterns that arise from our skin’s physiology. (Molho-Pessach & Schaffer, Clinics in Dermatology, 2011)

This groundbreaking research was recently published in the Journal of the Mechanical Behavior of Biomedical Materials, shedding light on the intricate mechanisms behind the formation of wrinkly fingers.

TAGGED:AnswerfingersMysteryScienceAlertwaterWrinkle
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