Gua Sha is a traditional healing technique of Oriental Medicine that involves press-stroking the smooth edge of a tool over a lubricated area of the body’s surface.
The action produces a “transitory therapeutic petechiae called ‘sha’ representing extravasation of blood in the subcutis” Arya Nielson PhD., that resolves in 2-4 days. The more blood stagnation there is, the more sha there is. If there is only qi stagnation the area treated will get pink, but it will fade very quickly.