Thanatomorphose

A young woman's life takes a dark and bizarre turn when she begins to experience signs of decomposing, both physically and mentally, after a night of rough sex with her abusive boyfriend. As her body slowly rots away, she becomes increasingly detached from reality and descends into a world of strange and disturbing sensual experiences. Despite the putrid state of her body, she clings to her new existence with a twisted sense of fascination and horror. But as the decay progresses, it becomes clear that there is no escape from the inevitable fate that awaits her. Will she find a way to reverse the process before it's too late, or will she succumb to the Thanatomorphose that has taken over her being?

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Some movies that have similar genres and were produced around the same time as Thanatomorphose include The Ruins, The Ritual, Triangle, Evil Dead, The Uninvited, The Conjuring 2.