Podophyllotoxin is a kind of Chinese patent medicine, which is composed of salicylic acid, benzoic acid, boric acid, bitter ginseng, talcum powder, with the efficacy of clearing heat and drying dampness (removing heat and drying dampness), killing insects and astringent sweating, and it is mainly used for the treatment of ringworm of the hands and feet and stinky sweating caused by dampness-heat infiltration (invasion of intestines, bladder, pubic area and lower limbs by dampness and heat evils). Podophyllotoxin can be used to soak feet within the scope of indications. Adverse reactions of foot light san is occasionally caused by contact dermatitis, blistering, vesicular tinea pedis prohibited the use of, need to pay attention to the foot light san for external use, can not be taken internally. Children, pregnant women are contraindicated. If you need to use drugs, it is recommended to use under the guidance of a traditional Chinese medicine practitioner, not unauthorized use of drugs.