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Why your fingernail leaves a mark on your leg when you press hard
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Your fingernails are made out of keratin, which is a type of protein. Keratin is hard enough to make a mark on your skin, and your skin is softer than keratin. When you press down very hard on your skin with your fingernail and keep pressing, your fingernail will make it's way through the first couple layers of skin. So when you take your fingernail away, there will be a dent where the first bit of skin parts. However, when an elastic band or a stretchy object is on your wrist or ankle, the object pressures your skin down and cuts off your circulation. This is because when an object presses down hard enough near a vein or artery, the blood cannot get through. Sometimes your hand or foot might feel cold when this happens because the blood cannot get through to warm it. |
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