Hello, what you see one by one is the tendon on the back of your hand and instep, which is the muscle end that controls the movement of your fingers. Some people have thick subcutaneous fat, so it is not obvious. Some people have thin subcutaneous fat on their hands and feet, so it looks obvious. This is a normal phenomenon. When bending upward, the muscles control the bones of fingers and toes upward, but the tendons are connected between the wrists and the roots of fingers, which will become obvious.

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