Raw yam may have an itchy mouth because the skin of the yam contains saponin, and itching occurs when the skin comes into contact with this ingredient.
After the yam has been heated and cooked, the foreign protein that triggers the allergy has been denatured, so there is no allergy. In addition it is best to wear gloves when processing fresh yam to prevent your hands from itching due to contact with allergens.
Yam, is the rhizome of the plant Dioscorea spp. of the family Dioscoreaceae. It has the efficacy of benefiting qi and nourishing yin, tonifying the spleen, lungs and kidneys, and fixing essence to stop the belt. It can be used for treating spleen deficiency with little food, tiredness and fatigue, loose stool and diarrhea, lung deficiency with asthma and cough, kidney deficiency with spermatorrhea, dyspareunia and frequent urination, and internal heat and thirst. Contraindications to use, adverse reactions are not clear.
Discomfort is recommended to consult a doctor in time, do not self-diagnosis, so as not to delay the condition.