"Rotting from the inside out"

Thanatomorphose

Bruised from a night of rough sex, a young woman is shocked to find that her body, rather than healing itself, has inexplicably begun to rot. Swept up in the strange sensual experiences brought on by her slowly decaying form, she tries desperately to cling to her new existence — even as the putrid meat sack that was once her young body begins to literally fall off her bones...