I had this done when i did my abroad in china last summer, and its never suppose to bleed to that level >.>. But its suppose to cure Multiple aliments such as colds and other Inflammatory lung conditions. it does seem a little extreme, one of my classmates told me that if you do this regularly the marks will basically become non existent after the process meaning you were very healthy. Whats even weirder (something that i think is just a cash grab) is Gua Sha which is a process of people scraping your skin with different animals bones... apparently if you scrape where ever ur ailment is it will be cured...