Gua Sha is a traditional Chinese medical treatment when the skin is scraped to produce therapeutic petechiae.  The smooth edge of an instrument is placed against the skin, pressed down firmly, and then moved along the muscles or along the pathway of the acupuncture meridians. This would cause extravasation of blood from the peripheral capillaries and may result in sub-cutaneous blemishing which usually takes 2–4 days to fade. Gua sha releases unhealthy elements from injured areas and stimulates blood flow and healing.