Don't scrape for too long, because the qi and blood are limited, sometimes it will lead to the legs, and then scrape other parts, not necessarily the qi and blood will pass, depending on personal physique. If you are in good health, you can do it relatively. You can do a project every day if you are weak. I don't know if these questions can be answered. If you don't understand, recommend a Chinese medicine health network, which has a special scraping plate to discuss.

/Dadawang Traditional Chinese Medicine Holographic Meridian Health House