Cupping therapy is an ancient form of alternative medicine in which a therapist puts special cups on your skin for a few minutes to create suction. People get it for many purposes, including to help with pain, inflammation, blood flow, relaxation and well-being, and as a type of deep-tissue massage. It involves suctioning the skin with glass, plastic, or silicone cups. It may help improve blood flow, boost immune function, remove toxins, and reduce pain.