Itchy hands after contact with yams may be caused by contact dermatitis, which can be improved by local cleanup, medication and other help. 1. local cleanup: yam contains alkaloids, saponins and other easily sensitized chemicals, will stimulate the hand skin nerve endings lead to itching symptoms. Therefore, if you want to effectively improve the hand itching symptoms, the first thing to do is to use tap water to rinse a lot of hand skin, to remove the hand stained with yam sensitizing ingredients; in addition to yam in the allergenic substances in the heat easy to decompose, the use of hot water soak your hands can also help to relieve the itching. 2. medication: for contact with yam hand itching symptoms are more obvious patients can also be local use of glycerine lotion, compound flumethasone ointment and other drugs for local application to help improve the itching symptoms, external use of drugs after the itching symptoms did not significantly improve the need for oral cetirizine, ibogaine, loratadine and other antihistamine medications to help control itchy yam skin caused by the symptom. It should be noted that, after contact with yam hand itching symptoms are more serious patients should pay attention to avoid contact with yam, in order to prevent the occurrence of severe allergic reactions; the above treatment and medication should be carried out under the guidance of a physician, to avoid the occurrence of adverse reactions.