Generally use alum foot soak soak 3-4 times, can make the feet sweat less. The effect may not be very good because it is not to inhibit sweat secretion. From the perspective of Chinese medicine, alum has the function of killing insects and relieving itching, drying dampness and detoxification. Generally 2 times a week for 2-3 weeks to play a certain effect, that is, to soak 3-4 times to do. It is recommended to maintain the treatment for 30-45 days and then stop using it. From a modern medical point of view, the main component of alum is potassium aluminum sulfate dodecahydrate, which belongs to a mineral, after contact with the skin, for the skin surface of the fungus has a certain inhibitory effect, for sweaty feet have improved the effectiveness. The alum foot soak is recommended to be used under the guidance of a doctor, do not use it blindly, so as not to cause irritating dermatitis with too high a concentration.