When you stilt your legs, the popliteal fossa of one leg is pressed against the knee of the other leg. Because the knee area is relatively hard, will cause pressure on the popliteal fossa area, from the popliteal fossa area through the nerves innervating the leg will cause irritating pressure symptoms, that is, the legs appear numbness symptoms, change the position, the symptoms will disappear, there is no need to worry about it, and there is no need to carry out any treatment. But this kind of stilt legs is a bad habit, should try to avoid, so as not to cause damage to the nerves of the leg.