Prosopometamorphopsia (PMO), also known as demon face syndrome, is a neurological disorder characterized by altered perceptions of faces. In the perception of a person with the disorder, facial features are distorted in a variety of ways including drooping, swelling, discoloration, and shifts of position.

Prosopometamorphopsia is distinct from prosopagnosia, which is characterised by the inability to recognise faces.

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