The first thing you need to do is to keep the foot a bit elevated on a pillow to reduce the swelling. If the redness
is bright red it implies that there is dissipation of blood over the dorsum or upper part of the foot. This most likely results from fracture
and the management is essentially conservative as the accumulated blood would be absorbed in due course of time. However, depending on his blood sugar levels, he might need a prophylactic antibiotic to ward off the chance of any serious infection. Also, hot compresses over the area and analgesics are needed. Alarming signs are if the swelling moves up the foot, if he develops fever
and if there is alteration of sensation in the involved toe with it getting black. If these develop you should rush him to the ER.