Fire cupping involves soaking a cotton ball in 70% alcohol. The cotton is then clamped by a pair of forceps and lit via match or lighter. By adding fire to the inside of the cup, oxygen is removed and a small amount of suction is created by the air cooling down again. Massage oil may be applied to create a better seal as well as allow the cups to glide over muscle groups.
Fire cupping uses glass jars that have an ignited material (I use cotton balls soaked in alcohol, held tightly by a set of hemostats) placed briefly inside them to create negative pressure. The flame is then quickly removed and the jar placed over specific areas of the body creating suction. This pressure moves the Blood, Qi and fluids of the area raising a petechiae rash–that’s a good thing in this case.