A small and narrow section of facial hair that is between a man’s lower lip and chin is often referred to as a Soul Patch.
One theory suggests that the term came about due to the style's association with performers of soul music dating from the 1950s and 1960s.
BuzzFeed.com has a list of their 23 Most Important Soul Patches Of All Time, from Ray Charles to Stevie Ray Vaughan. Also check out from the pencil 'stache to the handlebar, 100 years of facial hair history.
And here are 5 steps for growing your own soul patch.