Foot Guang San is a topical medicine with the effects of clearing heat and drying dampness (removing heat and drying dampness), killing insects and astringing sweat. Podophyllotoxin is composed of bitter ginseng, talcum powder, salicylic acid, benzoic acid and boric acid. It has the efficacy of clearing heat and drying dampness, killing insects and astringing sweat. It is mainly used for the treatment of keratosis pilaris and smelly sweating caused by dampness-heat underflow (dampness and heat evils invading the intestines, bladder, pubic area and lower limbs, etc.). Blistering type, vesicular tinea pedis is prohibited. Children, pregnant women are prohibited. Avoid eating spicy, stimulating food during use. Do not contact with eyes, mouth and other mucous membranes. Skin ulcers are prohibited. Use once, observe for 3 days, no adverse reaction, can be used for 3 times; if the symptoms are not relieved, should go to the hospital. If you need to use Podophyllotoxin, you must use the medicine under the guidance of a professional doctor.