When it comes to bodies, there is violence done every day. I did not think of body horror as a sub-genre when writing it, but I think the body is a source of great anxiety to each of us. So you shave (legs, armpits, or chin), taking a blade to yourself; perhaps you exercise, causing yourself pain; perhaps you fast or diet, denying yourself; perhaps your job means you have to stay awake. If you think about it, life itself consists of low-levels of body horror all the time. To write fiction, we just exaggerate some of what happens naturally...