Torn callus on the ball of foot?

I was exercising barefoot a few days ago and I noticed a callus had formed on the ball of my foot. Yesterday the callus tore, so I cut the rest of with scissors. It was realy pink underneath (no blood) and it hurts a bit when I walk. I washed it with hydrogen peroxide to avoid infection and put a bandaid on it. What should I do to help it heal faster, and how long should I keep a baindaid on it?