The fingers will usually wrinkled hands after bathing or playing water for long periods. Conditions like this are normal, but what causes it
wrinkled hands and feet when in the water?
After finishing a shower or a relaxing swim in the pool, people will usually find a wrinkled hands and feet. This condition usually occurs when a person spends more than half an hour in the water. And the outer skin (epidermis) that is responsible for this condition.
Epidermis contains keratin protein that serves to strengthen and help keep skin moist, dead keratin cells that will form a separate layer in the epidermis, known as the stratum corneum (a layer of horns).
As quoted from HowStuffWorks, Wednesday (08/18/2010) dead keratin cells in the stratum corneum will absorb water readily and begin to swell after a long soak in the water, but not in keratinized cells of the living. This makes any body part that swells, while other parts are not that look like wrinkles.
In addition, human skin is coated by a special oil called sebum. This special oil is found in the outermost skin layer (epidermis) that serves wet or lubricate and protect the skin, one of which makes the skin less resistant to water. This makes the water flow in the skin when washing hands.
But if someone is bathing or playing in the water for long periods, then a layer of sebum will disappear and make the water can penetrate the outermost skin layer. This makes the skin look like wrinkles.
Why are wrinkles only occur on the soles of the feet and palms?
This is due to the palms and feet have thick skin so that the layer keratinnya also thicker than other body parts. These conditions make the palms of the hands and feet are more prone to wrinkles.
But the wrinkles on the palms of the hands and feet is normal, because it's one way to eliminate them is to immediately warm or dry the body.
source: (http://www.detikhealth.com/read/2010/08/18/170036/1422917/766/habis-mandi-kok-tangan-jadi-keriput)