2. Pregnancy or menstruation should be postponed.
3. The hesitant blood after meals is concentrated in the digestive system and should not be used.
4. After use, the blood vessels on the skin surface dilate, and should rest for 6-10 hours before bathing.
5. Use in the same direction, not up and down, left and right.
6. The hesitant negative pressure gravity will appear scabby phenomenon, should be delayed for a few days, in the use of instruments, the effect is better.
