Touching the yam hand itching, usually because of the yam allergy, can be used to rinse water, apply edible vinegar, medication relief. 1. water rinse: after touching the yam itchy hands with a lot of flowing water rinse hands, the hands of the itchy substances clean. 2. Apply edible vinegar: yam itchy substances and yam alkaloids in the yam, after cleaning hands can be coated with edible vinegar, so that the vinegar and alkali alkaloids acid-base neutralization reaction occurs, reduce the concentration of itchy substances, alleviate the symptoms of itchy hands. 3. Medication: If the symptoms of itchy hands are more serious, you can take medication under the guidance of a professional doctor. Oral anti-itching drugs, such as paracetamol, loratadine and so on. At the same time can also be coated with some anti-itch ointment, such as halometasone ointment. When touching the yam hand itching, mild can be relieved with the help of the above methods, continue to aggravate the person should be timely consultation in the regular hospital dermatology, under the guidance of a professional doctor for treatment.