This reminded me of a girl I used to know back in our teens, and she wanted to scare a group of guys who used to tease her. They would put worms in her food, or just tease about her looks. So she went to a local costume store behind the railroad tracks, and she bought this hideous monstrosity of a mask. The skin was gooey green-yellow, and it look like the face of a demon, its fangs were so life-like. It look so real on her, that it even attach itself against her skin as the night was coming to an end. She did scare the guys, but she look like she lost her marbles, howling to the wind. I don't know how she was able to even remove the mask, because there look like there was no line at all from her skin and the mask.
But back to the point, she looked in the mirror and started freaking out, "Those are not my eyes! Those aren't my eyes!! Where are my eyes" And she ran out in total fright, as I called out to her. It was true, her eyes became greenish olive, when they used to be blue.
The next morning she didn't tell me what happened or how she removed the mask, and we kind of just never spoke of it ever again.