Yam mucus contains saponin, which is an allergen. Contact dermatitis may be caused by human skin contact. The most common symptom is itchy fingers. In severe cases, symptoms such as redness, swelling and tingling will appear. Many people feel itchy when cutting yam, which is an allergic symptom. Don't touch yam directly with your skin.

If you want to avoid direct contact with yam, you can clean it, put on gloves or peel it directly on your hands with plastic wrap; You can also wash the yam and cook it in boiling water, so that saponin in yam mucus will be destroyed, and peeling will not cause allergic symptoms.

Yam is a very nutritious food, rich in starch, carbohydrates and vitamins. After eating, it can supplement various nutrients needed by human body, enhance physical fitness and improve human immunity.

Yam is rich in amylase, polyphenol oxidase and other substances, which can help people's stomach digest food. Regular consumption of yam can prevent spleen and stomach weakness and diarrhea.

Yam contains mucin, which can lower blood sugar. Regular consumption of yam can help everyone to stabilize blood sugar, can be used to treat diabetes, and is a wonderful diet for diabetic patients.