It is the burning of an herb called Mugwort. The herb or Moxa can take many forms, including cigar-like moxa rolls, raw rice grain-sized pieces, and compressed smokeless sticks.
Moxa is burned directly or indirectly over the Acupuncture points. It will regulate or move the blood and energy. It is a therapy that can prevent and treat diseases with heat stimulation on acupoints. One of the common uses of Moxa is to treat chronic pain.