As oxygen is known to have healing capabilities, it is said that H2O2 cleans the wound. The heavy foam and bubble formation is due to the formation of oxygen. The same thing can be seen even when we put H2O2 on a cut potato. There are other examples of bubbling hydrogen peroxide. On a rough surface it bubbles heavily, and on smooth surfaces it remains still. When earrings are put into a hydrogen peroxide liquid, it bubbles for some time and then stops.