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]
(..) There's only one. We'll be right there. We're just trying to decide something. - They're trying to decide something. - Good. Good, good. So was your mustache... Did it used to be different? How do you, you know, keep it so neat? I have a comb. - What is that? - A mustache comb. Thank you. Okay, I will do your laundry for one month. I will, I will, I will... I will clean the apartment (..)1996 TvShow: Friends Title: The One Where Dr. Ramoray Dies Season: 2 Episode 18