Praise be to Allah.
It is permissible to pluck it, because it is not part of the eyebrows. And Allaah is the Source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and his family and companions.
From Fataawa al-Lajnah al-Daa’imah, 5/197
This ruling applies to both men and women. And Allaah knows best.