At present, it is believed that the factors leading to this kind of contact dermatitis are saponin contained in yam skin or phytoalkaloid contained in mucus, and skin will itch when it comes into contact with these two components. If the skin is dry and chapped or damaged, it is more likely to sting and avoid contact.
If the symptoms of itchy fingers have appeared, you can try the following methods: First, wash your hands first, then put vinegar on your hands, and don't even fall under the fingernails. After a while, this itching will gradually disappear, which is due to the neutralization of acid and alkali. Second, you can also bake it on the fire, flip the palm repeatedly, and let the hand be heated, which can decompose the saponin that penetrates into the hand. But be careful not to burn your skin. Third, putting your hand in rice and rubbing it repeatedly can also relieve itching.