What we call tinea pedis is tinea pedis, which is caused by fungal infections of the feet. For fungal infections of the feet, in addition to applying topical and internal medications for antifungal treatment, it is also necessary to keep the feet dry to prevent secondary bacterial infections after fungal infections of the feet. It is now known that alum is a weakly alkaline substance, weakly alkaline substances can absorb water, so that the foot to keep dry, so alum for the prevention of tinea pedis as well as the treatment of tinea pedis is a certain role, but the application of alum, remember to control the concentration of alum, to prevent alum concentration is too high, but also because of its alkaline burns the skin of the foot, resulting in secondary damage.