The act of sensitizing a part of the skin, through suction. Originally used in ancient Medicine, for various treatments, that drew blood closer to the surface of the skin.
Suction cups found in snake bite kits are often used, or a tube from which the air can be sucked from, are used.
Care should be taken to insure extreme force is NOT applied, as it can create welting.
Usually applied to the area around the nipples, to further sensitize the skin.
Ancient practises used a glass cup, that was rubbed with a flammable liquid, then set alight. The device (usually a glass cup) was quickly placed securely over the skin, to create a suction, that extinguished the flame inside, and created the vacuum effect. Risk of burning exists.