Le dos rouge (2015)

A famous filmmaker works on his next film, which will focus on monstrosity. He is obsessed by the idea of finding a painting that will be central to the film and will crystallize all the power and beauty of monsters. But what he doesn't show to anyone, not even his wife, is the mark on his back that keeps getting bigger. This red mark worries him, upsets him, and seems to want to tell him something...