The role of the cutman in boxing and MMA is very important. He does his job unobtrusively, but his hard work is essential. An athlete cannot continue to fight if his face turns into a bloody mask. The cutman must do his job quickly and with a minimum of medical supplies. The doctor is allowed to use the following tools and substances: petroleum jelly (to apply to open wounds and to stop bleeding), gauze compresses, an ice bag (placed on the sore area of the boxer to prevent swelling, or on the neck area if the boxer has been knocked down), a swelling iron (a small piece of metal with a handle to artificially cool the injured area and to remove the bruise by smoothing the injured area).