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cold compress: put it into the refrigerator, after pre-cooling treatment (4-10 degrees refrigeration) for two hours or frozen for half an hour, you can wear it on the face. it can be stored in the refrigerator for a long time. in order to prevent tainting by odor, it is better to put it in a cool bag compress: put it into warm water of 60 temperature for about 5 minutes or in the microwave for 30 seconds, then heat the other side for 15 seconds, you can wear it on the face. it is usually recommended to heat in water and heat it evenly. no matter it is cold compress or compress, the temperature should not be too high or too low, and the time should not be too long..syi