I'm usually all for identifying spirits based off folk lore and my own experiences, but your description makes me think this is either role play, dreams, or thought forms. Do you like fantasy movies and books?
The white masks with no eyes or mouths seems more symbolic to me than anything. They are not alive but mechanical. Machines do not need to see, talk, eat, or experience any senses to "perform". And that's exactly what thought forms are, especially servitors. This sounds like something shaped from the imagination into the astral without conscious effort. I find that most egrigores, thought forms, tulpas, servitors and the like don't have faces unless they're made to have faces. Sometimes they have no forms at all and are mistaken for shadow people very frequently.
A banishment, proper house blessing, or a thorough cleansing should get rid of them. Remember though, because they're created by your mind, you can bring them back with a mere thought. That's why it is important for us as practitioners to be able to control our thoughts and emotions--we manifest them naturally. So stop dwelling about it! And definitely don't fear it. Forget about it. Busy yourself. Be sure whatever you do to "get rid" of them is something you really believe will get rid of them. That's key. Convince yourself.
The majority of neophyte spiritual issues are self created and not spirits at all. Heck, even many experienced practitioners fall into that trap. You have to relax and realize that spirits are not out to get you and your mind is stronger than you think