To dream that you are wearing a mask implies that you have said or done something that has been taken out of context. This has caused problems and disharmony with others. It may also mean that you are concealing yourself behind a facade and not allowing others to see who you really are.
To see others wearing a mask in your dream indicates that you will be forced to confront dishonesty, envy, and treachery.
To see others unmasked in your dream suggests that you have been unable to impress another person. Your efforts have failed.