The reason is: the mucus contains plant alkali, contact with the skin will sting. The saponin in the skin of the yam makes the hand very itchy,

Solution:

If the hand is very itchy, you can wash your hand carefully, and then dab your hand full of vinegar, and even the nail gap is dipped, after a while this itchy feeling will gradually disappear! (Reason: acid-base neutralization) can also be roasted on the fire, repeatedly turning the palms of the hands, so that the hands are heated. This can break down the saponin that seeps into the hands. The above is taken from Baidu know There is a way to not wear gloves, my mother is usually steamed on the pot, about 3-4 minutes, cold and cooled and then peeled, and then it's good, I think it's not bad, it's a bit of a hassle, but I still like to wear gloves, more convenient, there are gloves on the top of the rough surface, will not be slippery.