The reason why fingers itch is because taro skin contains alkaline mucus, which is called grass acid base and has a strong stimulating effect on the skin. Saponin in taro skin makes hands itch. The preventive method is to wash your hands with vinegar before cutting taro. The acidity of vinegar can neutralize this alkali. If you already feel itchy, you can wash it with warm water or bake it on the fire for a while, and the itchy feeling will disappear. You can also wipe your hands with peels such as lemons and oranges. In fact, you can cook the whole taro first and then peel it, so that the nutrition will not be lost and it will not cause your own itching symptoms.