Cupping is the term applied to a technique that uses small glass cups or bamboo jars as suction devices that are placed on the skin to disperse and break up stagnation and congestion by drawing congested blood, energy or other humors to the surface. In dry cupping, the acupuncturist will simply put the suction cups on the skin. In wet cupping, the acupuncturist will make a small incision on the skin and then apply the suction cup to draw out small amount of blood.