為午麼抓腳底會痕??

The soles of the feet contain the thickest layers of skin on the human body due to the weight that is continually placed on them. Most think that the skin on the soles of the feet is very thin, hence the increased sensitivity to touch on the soles of the feet. This, however, is a myth. The soles of the feet are also the region in the body where the most nerve endings（較多神經末梢） are located. This sensitivity is also the reason why the plantar reflex can be slightly unpleasant for some.

因為腳底有較多神經線。

2006-10-18 21:19:39 補充：
所以比較容易感到痕