You can put plaster on your broken foot, but it is best to do so after the acute phase, because during the acute phase, the local blood vessels are broken and there is blood seepage from the damage, after putting on the plaster, the blood vessels expand, which may increase the bleeding and lead to more obvious swelling and is not conducive to recovery. In addition, the plaster should be applied after 48 hours after the foot is broken, because at this time the blood vessels have basically closed and there will be no more blood seepage, after the plaster is applied the blood vessels expand and blood circulation is accelerated, which can help the metabolism and absorption of inflammation and stasis of blood and other related metabolites, which can promote the reduction of swelling and pain, and also promote the healing of local tissues. But after a broken foot can not rely solely on plaster, should also be braking, relaxation rest, and to elevate the injured position, through the role of gravity to promote the elimination of swelling, in addition to the injury can be appropriate cold compress, can reduce the local tissue damage seepage of blood, can prevent the emergence of swelling and other conditions.