When peeling yam or taro, your hands will be particularly itchy. The reason is that yam mucus contains plant alkali, which itches when it touches the skin. The saponin in the yam skin makes your hands itch.

Solution:

If your hands itch, you can wash them carefully and cover them with vinegar. After a while, the itching will gradually disappear. The principle is acid-base neutralization. You can also put it on the fire and bake it. Turn the palm of your hand repeatedly to make your hand hot. This can decompose the saponin that has penetrated into your hands.