What common barbering service involves cutting facial hair?

Beard trimming is a common barbering service specifically focused on maintaining and shaping facial hair. This service typically involves cutting, shaping, and grooming the beard to achieve a desired look or style. Barbers use various tools such as clippers, scissors, and trimmers to provide precise and clean cuts, allowing clients to present a polished appearance.

While hair coloring, hot towel shaves, and scalp massages are all grooming services that might occur in a barbershop, they do not primarily focus on cutting facial hair. Hair coloring pertains to changing the color of hair on the scalp, hot towel shaves involve the application of hot towels and shaving techniques for smooth facial hair removal, and scalp massages target the scalp for relaxation and stimulation, rather than the grooming of beards or mustaches. This distinction further emphasizes why beard trimming is the most accurate response to the question asked.