The skin is an important immunological barrier of the body. Gua Sha, which involves press-stroke treatment of the skin, is an effective folk therapy, widely accepted in East Asia, for various symptoms.
The mechanical press-stroke movement enhances surface microcirculation in the skin tissue and induces the expansion of capillaries, including the blood vessels and lymphatic vasculature. The increased blood and lymphatic flow leads to more rapid substance and cell exchange among blood, interstitial fluid, and lymphatic fluid.
Also, the extravasation of blood and blood components, i.e., red blood cells and platelets, into the subcutis can induce multiple effects on immunity and inflammation, leading to a fluctuation in cytokine levels and initialization of the wound-healing process
In addition, Gua Sha generates temporary warming effects on the skin tissue, like short-term and local fever. This thermal element of Gua Sha might also contribute in stimulating the innate and adaptive immune responses.
The Gua Sha is a non-invasive tool, it is suitable for all skin even the most sensitive.