Clinically, some people’s hands will be itchy after handling yam, which is mainly considered to be due to allergies. The mucus of yam contains a kind of saponin, which can cause contact dermatitis after skin contact, manifested as itching, tingling, redness and swelling of the skin. Therefore, you need to wear gloves before handling yam skin or touching yam, which can effectively avoid contact with the mucus and thus avoid the occurrence of contact dermatitis. After contact with the mucus need to immediately wash thoroughly with water, can be a certain degree of relief, if the symptoms are not relieved, you can take oral antihistamine for anti-allergy treatment, if necessary, to the hospital dermatology consultation, for more targeted treatment.