MissionCupping
"Cupping refers to an ancient Chinese practice in which a cup is applied to the skin and the pressure in the cup is reduced (by using change in heat or by suctioning out air), so that the skin and superficial muscle layer is drawn into and held in the cup. In some cases, the cup may be moved while the suction of skin is active, causing a regional pulling of the skin and muscle (the technique is called gliding cupping).
Cupping therapies often follow the point selection pattern that is used for standard acupuncture therapy, with somewhat greater emphasis on the use of back points (due to the ease of performing this technique there).
In order to allow easy movement of the glass cups along the skin, some oil is applied. Medicated massage oils (with extracts of herbs) are particularly useful for this purpose. Since the cups are applied at room temperature, the indication of removing cold from the channels is no longer as applicable, at least to stationary cups. There is some friction generated with moving cups, so that there is a small but significant amount of heat applied by that method, especially if a warming oil is used as lubricant.
Generally, the cup is left in place for about 10 minutes (typical range is 5–15 minutes). The skin becomes reddened due to the congestion of blood flow. The cup is removed by pressing the skin along side it to allow some outside air to leak into it, thus equalizing the pressure and releasing it. Some bruising along the site of the rim of the cup is expected.
Today, cupping is mainly recommended for the treatment of pain, gastro-intestinal disorders, lung diseases (especially chronic cough and asthma), and paralysis, though it can be used for other disorders as well. The areas of the body that are fleshy are preferred sites for cupping."
From the Article: Cupping, by Subhuti Dharmananda, Ph.D., Director, Institute for Traditional Medicine, Portland, Oregon