In chinese,"gua" means rub,scrape or friction, and "sha" is a 'reddish, elevated, millet-like skin rash' (aka petechiae). sha is a term used to describe blood stasis in the subcutaneous tissue before and after it is raised as petechiae.When scraping is applied to related skin with moderate strokes, the sha will surfaces on the skin as small red petechiae. In minutes the petechiae will fade into echymotic patches. The color and rate of fading are indicators for the diagnostic and prognostic.Gua sha is one technique that intentionally raises sha rash or petechiae. and gua sha is absolutely a natural theraphy and no need any medicine which more or less have harm to human body.