Using a glass cup and some fire to create a suction, cupping is used to pull toxins from the superficial muscles and promote circulation of blood, energy, and lymph. It can be used for sore muscles, detoxification, acute sickness, as well as relaxation. Because cupping pulls this stagnation to the body's surface, cupping can sometimes promote an area of discoloration that resembles a bruise and may last for a few days following treatment.