In the US its known as “coining” or “scraping”, but there is much more to the treatment process than it suggests. As part of Traditional Chinese Medicine, this treatment uses lubrication and a ox bone to raise the metabolic waste out of the tissues and frees up blockages in chi. Petechiae is the red spots or result of the treatment that signals the body to cleanse the treated area. Increasing circulation and blood flow.
For more information: http://www.pacificcollege.edu/news/press-releases/2015/05/05/science-gua-sha