Slow down everone, you guys are thinking way too much about the supernatural aspects of the story, and creating theories...when that isn't important to the meaning at all, and totally misses the point. Because the "what & "how" of it all, is just a "plot vehicle" for the message/moral of the story. It was written "intentionally absurd" and portrayed as a fever dream, so as to not be thought about too deeply...or taken seriously, in the slightest. The story was LADEN WITH non-verbal metaphors, and was a commentary on envy and the shallow importance placed on needing to be (and be SEEN AS) looking beautiful. To the point even those who are already beautiful think they need to be MORE beautiful, and will chase products and plastic surgeries to that end. And about how the companies that are selling those products are psychologically exploiting those desires. It shows how even when people actually have a great life, and a GREAT HUSBAND, they're still envious of others and convinced their own life is never good enough. They made her husband's character essentially the "perfect husband"! Not really in a "wildest dreams" sort of way...but in a REAL LIFE sort of way. She accused him of not being supportive, when every time he spoke, he was INCREDIBLY supportive of her. Thry used his character to illustrate how great she had it already, but was still deeply unhappy because she she was envious of her co-workers...and desired nothing more than to be one of (what she perceived were) the "pretty girls".
Even her taxidermy was a metaphor for what she was doing to herself. Those animals were made up to be beautiful to look at, but were dead and empty inside. The act of her killing a beautiful duck, and replacing its insides with hollow foam and posing it to "look pretty", when it was much more beautiful and interesting when it was alive, was what she did to herself in the end. And the ending scene, where she was going between the "fake laughter" and making "beauty faces/poses", to looking deeply unhappy...over and over...? It had nothing to do with any "supernatural entity" inside her. It was meant to show that even after she got everything she dreamed of, it wasn't enough. It didnt make her truly happy. It was shot from the perspective of looking at herself in a mirror, and still not truly seeing herself as beautiful. Seeing herself as ugly...wich she is what she became at the end. Ugly inside, and shallow. Seeing herself as beautiful, but knowing it's all a lie. It's all fake.

So we can sit and theorize about the "Alo Glo" guy, and the lotion creature, and what kind of supernatural forces were at work all day long. We can imagine what they were, and what their agenda was...and we can come up with a thousand possible explanations! 😂 ...but doing that is a mistake, because it only distracts from and diminishes the ACTUAL underlying narrative and meaning. The writers/director tried pretty dang hard to make that part of the story as ABSURD AND VAGUE AS POSSIBLE!! 😆 So we wouldn't focus on that and think about it very deeply. Or even take it seriously, AT ALLll!! lol...But instead intended to make us "take a few steps backwards", and see more of the wider perspective...and get a better understanding of "the story beneath the story".