From the Sefer Nishmas Avraham Siman 182
וכן שמעתי מהגרש״ז אויערבאך זצ״ל לגבי בחור שצמחו לו שערות בין שתי גבות עיניו שזה נקרא מום ומותר לו להסירם: Uni brow is called a blemish and it can be removed.
The Shulchan Aruch (Yoreh De'ah 182:1; unofficial translationtranslation available) holds like the Rambam (Avodas Kochavim 12:9; translation available) that one can remove other hair from the body with scissors except for the armpits and bais ha'erva. However there is a Mordechai that holds it is forbidden unless it causes the person tzar (pain), but the Shulchan Aruch doesn't bring that opinion down.
See Nazir 58b for the discussion of this topic.