The soul patch, the world's smallest beard style, is also known as a mouche or a jazz dot. This small patch of facial hair, just below the lower lip and above the chin, was once associated with the artistic intensity of the beatniks and jazz.
It was John Birks Dizzy Gillespie, famous jazz musician and trumpeter, who made this beard style famous in the 1950s and 1960s. Though he occasionally wore his soul-patch with a moustache, when he wore it by itself, it became a distinctive trademark. Soon, it was known as a “Dizzy Gillespie beard” and was imitated by jazzmen and, eventually, beatniks.
The smaller version of Imperial beard style was preferred by Jazz trumpeters, because of the comfort it provided when using a trumpet mouthpiece.
Allow the small area immediately below the middle of the lower lip to grow. Set the size according to your own preference as well as your growth pattern.