Myrtle contains chemicals that might help fight against fungus and bacteria, and reduce swelling. Myrtle (Myrtus communis L.) berries, seeds, leaves, and essential oils: New undiscovered sources of natural compounds with promising health benefits
 
People use myrtle for acne, canker sores, abnormally heavy bleeding during menstrual periods, persistent heartburn, warts, and many other conditions, but there is no good scientific evidence to support these uses. 
 
The essential oil of Myrtus communis is an antiseptic and astringent. Myrtle essential oil treats digestive, pulmonary or urinary infections as well as skin ulcers and haemorrhoids. It lightens heavy legs and prepares the body to exercise to prevent cramps and aches. It is effective against productive and dry coughs.
 
Don't confuse myrtle with periwinkle, which is sometimes called myrtle