He used a small pair of scissors to trim his 'mustache'.
The actor was wearing a false/fake 'mustache'.
a 'mustached' man [=a man who has a mustache]
(..) Is he looking? Is he looking? - We've got a problem. - Tell me. I can't do Chris' makeup. She refuses to acknowledge her mustache. - Is it bad? - It looks like her eyebrow fell down. Unless we convince her to let me bleach it... ...Van Damme will be (..)1996 TvShow: Friends Title: The One After the Superbowl: Part 1 Season: 2 Episode 12