Gua sha Gua sha (刮痧; guāshā) is abrading the pores and skin with items of clean jade, bone, animal tusks or horns or clean stones; right until pink places then bruising cover the area to which it is done. For more on the theory of how external Heat penetrates, https://rafael097k3.dm-blog.com/26901698/the-medicine-chinese-store-diaries