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]
(..) We need fresh towels in . Don't ask why, just do it. You have the flight number. He leaves tomorrow out of JFK. He'll be easy to spot. He's got white hair, a thin mustache... ...brimming with self-confidence and completely lost. - Did you get the stuff? - Yes. Good. (..)2006 The Pink Panther