Gua sha involves repeated pressured strokes over lubricated skin with a smooth edge. Skin is typically lubricated with massage oil and is scrapped traditionally with a Chinese soup spoon, or a well worn coin, or even honed animal bones, water buffalo horn, or jade. A simple metal cap with a rounded edge is commonly used today. Gua Sha releases unhealthy elements from injured areas and stimulates blood flow and healing
The smooth edge is placed against the oiled skin surface, pressed down firmly, and then moved down the muscle or along the pathway of the acupuncture meridians along the surface of the skin, with each stroke being about 4–6 inches long.
This brings blood from the peripheral capillaries to the surface and may result in sub-cutaneous markings (red-ish lines on the body), which usually takes about 2–4 days to fade away depending on your activity level.