Green color and pus from an open wound indicate the dying of the surrounding skin and tissue, the presence of clostridia bacteria, and the onset of localized gangrene.
Wash thoroughly with hydrogen peroxide, baking soda plus vinegar, again and again until the green color changes back to skin color and get rid of the pus by squeezing it out, sucking it out, scrapping it out, washing it out, and use first aid cream, iodine tincture, to close and heal the wound.
Use a household vacuum cleaner hose to suck out the pus.
With green pus, one must keep the foot exposed to air constantly. Do not wear socks or shoes. Wear open toe sandals to expose the wound. Clostridia and tinea pedis cannot survive in oxygen.