Gua sha Gua sha (刮痧; guāshā) is abrading the pores and skin with items of sleek jade, bone, animal tusks or horns or clean stones; till purple places then bruising go over the area to which it is done. For additional on the theory of how external Heat penetrates, https://milo0l53f.aioblogs.com/77359381/chinese-medicine-body-clock-for-dummies