Disease analysis: Hello, the ratio of magnesium sulfate wet compress to water is 50%. Guidance: I suggest that you can take 50% magnesium sulfate solution and heat it to about 40℃, soak it in gauze piece, take it out and wring it out slightly (don't drip water), apply it to the affected area, then press it with a hot water bottle and strengthen the heat preservation for 20 minutes.