Kanjo Pain Relief Gua Sha Myofascial Tool helps reduce pain, relieve muscle tension and stiffness, and improve circulation in the back, neck, feet, legs, arms, shoulders, and face. Gua Sha is a healing technique based on traditional Eastern medicine that involves scraping the skin ...Kanjo Pain Relief Gua Sha Myofascial Tool helps reduce pain, relieve muscle tension and stiffness, and improve circulation in the back, neck, feet, legs, arms, shoulders, and face. Gua Sha is a healing technique based on traditional Eastern medicine that involves scraping the skin to release fascial adhesions, and increase blood flow to help reduce pain and inflammation.