Yam allergy is usually an allergic reaction that occurs after contact with yam, which is a form of contact dermatitis, with skin symptoms such as erythema, papules, blisters and itching. Contact dermatitis is mainly caused by an allergic reaction to the skin caused by contact with exogenous substances. If you are allergic to yam yourself, contact dermatitis may be caused by contact with yam. Patients may have localized erythema, mild edema, pimples and other symptoms. If the condition is serious, blisters and blisters may also appear. If the blisters are ruptured due to lack of treatment or improper care, oozing and vesiculation may also occur. In addition, patients may also experience self-conscious symptoms such as itching, swelling and burning. If the above symptoms occur, consider contact dermatitis caused by yam allergy, it is recommended to go to the regular hospital for examination.