Cupping is traditionally used within Traditional Chinese Medicine, it normally consists of a glass cup which vacuum applies a certain level of suction (depending on the size of the cup).

It's usually used to improve circulation in the body and consequently relieve pain, it's also used to extract cold from deeper within the body and dispel stagnation.

Cupping can leave circular marks on the area of the body where it's applied and they could last for around a week, however, normally doesn't leave any pain lingering.