Podophyllum is a topical medication used for the treatment of foot odor with relatively few side effects. It is relatively corrosive to the skin and is not recommended for patients with delicate skin or children. A small number of people will experience allergic reactions, which are mainly manifested as local flushing, papules, itching and other symptoms. The molting of the feet after the use of Footlight San is mainly caused by local skin necrosis. In the process of using Footlight San, if allergic symptoms appear, it is necessary to stop using it in time to avoid aggravating the symptoms of local allergy. It is used for the treatment of keratosis pilaris caused by dampness and heat, and for the treatment of odorous sweating. When using Footlight San, you need to dissolve it in boiling water and soak your feet while it is hot for about 20-30 minutes if possible while avoiding burns.