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You've probably seen the videos: Influencers use facial gua sha to shrink double chins or chisel cheekbones. But long before gua sha was Instagram fodder, it was a traditional East and Southeast Asian healing technique. Originally, a smooth "board" was pressed along the skin of the body; more recently, it's been adapted for the face and neck too. The light pressure applied during gua sha is supposed to release muscular tension and help with lymphatic drainage to depuff.