1, put vinegar essence (if you can't buy it, you can also use white vinegar) in a wooden barrel with a ratio of 0.74: 1 and flour samples, mix them evenly for 5 minutes, then put them into a paste state, take them out and put them into a sealed wooden barrel for 12-24 hours, and control the temperature at 15-25℃. , wipe on the boils. Apply it once or twice a day.