Cause: Mucus contains plant alkali, which will itch when touching the skin. The saponin in the yam skin makes your hands itch.

Solve:

If your hands are itchy, you can wash them carefully and then cover them with vinegar, even under the fingernails. After a while, the itching will gradually disappear! (Cause: Acid-base neutralization) You can also put it on the fire, flip your palms repeatedly, and your hands will get hot. This can decompose the saponin that has penetrated into your hands.

Gloves are recommended when peeling yam after cleaning.

After peeling the yam, put it in water or salt water immediately, and it will not change color.