Wiktionary
n. A narrow beard descending from the lower lip, above the chin.
Wikipedia
The soul patch (also known as a mouche or a jazz dot) is a small patch of facial hair just below the lower lip and above the chin. It came to prominence in the 1950s and 1960s, when it was a style of facial hair common among African-American men, most notably jazzmen. It became popular with beatniks, artists, and those who frequented the jazz scene and moved in literary and artistic circles. Jazz trumpeters in particular preferred the goatee for the comfort it provided when using a trumpet mouthpiece. Jazz flute players who disliked the feel of the flute mouthpiece on a freshly-shaven lower lip also sported the look. Fly Barlow of Green Lyte Sunday was one such player.
Usage examples of "soul patch".
A black paramilitary beret with black glasses and a little fledgling soul patch.
He had that big pumpkin head the sumo guys had too, but his was recently shaven and he had a soul patch.
Coffee-light skin, dark hair, neat goatee with soul patch, big smile with lots of teeth.