My foot has a cut that keeps on opening wen kicking a heavy bag?

so im i muay thai, boxing and ive been learning the basic roundhouse kick. so both my feet right were the knuckle of the big toe is (like if the foot had knuckles the big toes would be cut) so basically everytime i kick it opens up it doesnt leek but it gets some of the blood on the bag and mitts plus my coach doesnt want me working like that wat ive been doing is taping my foot but its preety uncomfortable and sometimes the tape comes loose. i really dont wanna take a break and let it heal so wat do you think i should do im thinking getting one of those things they got in big5 were you rap it around something and it has velcro i think so it stays on sort of like a big think short handwrap and its brown redish would that be good.