Myrrh is a sap-like substance (resin) that comes out of cuts in the bark of trees that are members of the Commiphora species. Commiphora mukul, a related species, is not a source of myrrh. Myrrh is used to make medicine.
Myrrh is used for indigestion, ulcers, colds, cough, asthma, lung congestion, arthritis pain, cancer, leprosy, spasms, and syphilis. It is also used as a stimulant and to increase menstrual flow.
Myrrh is applied directly to the mouth for soreness and swelling, inflamed gums (gingivitis), loose teeth, canker sores, bad breath, and chapped lips. It is also used topically for hemorrhoids, bedsores, wounds, abrasions, and boils.