What causes the red spots from gua sha?

After a fever, if red rashes appear on the body, this is often a clear sign of excessive internal cold, dampness, and blood stasis obstructing the meridians. Prolonged blockage of the meridians leads to accumulation of stagnant blood, which then manifests on the skin surface as red rashes. The depth of the rash color often directly reflects the severity of internal obstruction—the darker the red, the more severe the stagnation may be. Although gua sha (scraping therapy) is notably effective in unblocking meridians and eliminating toxins and dampness, individual physical conditions vary. Therefore, patients should strictly follow medical advice when undergoing gua sha treatment to ensure proper technique and avoid bodily discomfort caused by incorrect application. Only through scientifically sound and appropriate gua sha therapy can the true goal of promoting health be achieved.