Some scholars would say that this is a type of adornment (zeenah) and should be covered from non-mahrams. Others would say that they should be covered if considerd as zeenah according to the common customs.
Others such as Sayed Sistani permit it based on the following conditions:
“Question: Is it permissible for a woman who does not observe hijãb to get rid of her facial hair, to straighten her eyebrows, and to wear natural and light make up?
Answer: Getting rid of facial hair and straightening the eyebrows do not prevent her from keeping her face open [while putting on the hijãb], provided she is confident of not getting sucked into something harãm and that exposing her face is not done with the intention of inviting harãm looks.
May Allah grant you success