A lot of small blisters on the hands and itchy may be contact dermatitis, eczema, herpes zoster, etc., should be promptly consulted to identify the cause. 1. Contact dermatitis, may be due to contact with tree hair, willow, lacquer and other plants caused by allergic reactions. It may also be an allergic reaction caused by contact with chemical products such as tar, gasoline, asphalt and kerosene. 2. Eczema, which may be caused by allergies to sunlight and ultraviolet radiation, genetic factors, drug irritants, medical diseases or infections. 3. Herpes zoster, which may be triggered by chickenpox-herpes zoster virus infection due to a decrease in immunity, has a painful sensation in addition to an itchy sensation. It is difficult to judge the disease by this symptom alone, and it is not excluded that it is caused by other factors. It is recommended that the patient consult a doctor in a timely manner to identify the cause of the disease and give targeted treatment, do not blindly deal with it on their own.