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What the name of this movie?

1.65K views#1 Moviesmirror sick skin train

All I have is a vague memory of a scene, what I remember is a lady inside what I think is a train and she is in the restroom looking at herself in the mirror when her skin starts moving, as if something moving under her skin. I also have a strange vision of chocolate pudding being in that scene?

Drobinson1055 Answered question Sep 18, 2020