Material preparation: Shanghai white vinegar (acetic acid content is more than 6%), Chinese medicine (Baijing cure ringworm formula) Preparation method: Soak Chinese medicine and white vinegar in a closed container for one week (the ratio of medicine to vinegar is 1 post of Chinese medicine and 5 kg of white vinegar) Use time: Between summer and autumn, or when the average temperature is higher than 30 degrees Use method: Add 1 bottle of 30% glacial acetic acid (30 ml) to the dregs of the medicine vinegar, soak the hands and feet Soak the hand and foot in the vinegar solution after washing, once a day for 30 minutes. Preservation of vinegar: Preserve the used vinegar in a cool place for 7 days, and replace the unused vinegar if the odor appears. Precautions: 1.It is forbidden for those who have skin erosion. 2.Do not use alkaline soap and washing powder during use. 3.Some patients, the affected area is more serious keratinization, then add glacial acetic acid concentration in appropriate amount, follow the doctor’s instruction. 4, a very small number of patients, after soaking occasionally see local redness, itching, please discontinue use, timely medical consultation.