Medical Quiz - Do You Know?

This is a real Quiz and I don't have the answer. This is a photo I took in Honduras of a woman's foot. It is resting on a wheelchair as she previously underwent a BKA (below the knee) amputation for complications of diabetes. She now had this strange, slightly ulcerated, non tender lesion on her foot for several months. You can see a smaller, less ulcerated lesion on her heel area.I could not