Sunken cheeks. Bloody lips. A gory gash or two. With a little work, you'll be the best walking horror show around. After all, it's the finer details that make a great Halloween costume truly horrific.

Many people suffer from sunken cheeks. Causes of sunken cheeks occur when there's not enough flesh between the zygoma (the bony arch of the cheek below the eye) and the mandible (the lower jawbone).