Alum foot soak has the effect of astringent and anti-sweat, in addition, alum also has certain antiseptic effect, so it can be used to soak feet to treat hyperhidrosis, foot odor, or have some effect on tinea pedis. Tinea pedis or sweating disorder are related to sweaty hands and feet, after sweaty hands and feet, it is easy to breed bacteria or fungus and appear foot odor or tinea pedis. This is because fungi and bacteria break down the skin’s stratum corneum and produce ammonia or other odors. Alum has an astringent and anti-sweat effect, and by changing the environment, bacteria and fungi will improve. In addition, alum has a bactericidal effect, so it can also reduce the growth of some bacteria and fungi, so it will also have some effect. In conclusion, alum foot soak can be used for hyperhidrosis of the hands and feet, as well as bacterial or fungal infections.