... lumbar muscles;perperal infection,dysmenorrhea;etc.Usage:Heat the bag in the microwave oven for around 1-2minutes, ... and then apply the bag at your neck,back,shoulder,waist,knee,muscle ... oven over 2 minutes.Long time heating of the bag in the microwave oven may cause scald when ... the temperature of the bag is too high, place the bag aside and let it cool down to a suitable ...