What causes the back to become very red after gua sha?

Redness appearing after back gua sha (scraping therapy) may be caused by the following reasons: 1. Accelerated blood circulation: During gua sha, the pressure and technique applied to the meridians and acupoints on the back stimulate local blood flow, promoting the removal of metabolic waste products to the skin surface, which causes redness. This is a normal physiological response that typically requires no special treatment and resolves on its own after some time. 2. Capillary rupture: The gua sha tool used during the procedure may cause friction and irritation to the skin, leading to broken capillaries and subcutaneous bleeding, which manifests as redness. If symptoms are mild, cold compresses may help alleviate them; however, if the condition is severe, medical attention is recommended. 3. Skin allergy: Individuals with allergic tendencies may react to the gua sha oil or the material of the scraping tool, resulting in redness, itching, and other allergic symptoms. In such cases, antihistamines or other anti-allergy medications may be used for treatment. The specific reaction may vary due to individual differences. If symptoms persist, prompt medical consultation is advised.