If you dream of masquerade mask, does it belong to you? If it is your mask, it can mean you are not comfortable with showing your identity to society. Maybe you have reason to distrust others. You want to protect yourself and you wear a mask to hide your true self.
If you are doing this consciously and you’re confident, you can manage your different identities.
If you have difficulties managing your masked identity, then you are at conflict with yourself.