Treat skin itching. Itching skin is very uncomfortable, and it can be treated with banana peel with good effect. Patients can choose fresh banana peel and rub it repeatedly on itchy skin, or mash it into mud, or decoct it with water for several days, all of which have effects. Lowering blood pressure and relaxing bowels. Bananas are sweet and cold, and have the effects of clearing away heat and moistening intestines and promoting gastrointestinal peristalsis. Prevention or treatment of hypertension. Bananas contain potassium, which can discharge excessive sodium ions and lower blood pressure. Another ion that lowers blood pressure is calcium. You can cut bananas into small pieces and mix them with milk in a blender to make antihypertensive juice.