There are many reasons why a patient might have difficulty healing a wound. Sometimes the blood supply to the affected organ is poor or the patient could have diabetes. In other situations, the surrounding tissue is just not healthy enough to support the healing process. Specialized wound care clinics have been developed to take care of some of these problems, and they use a variety of methods ( like hyperbaric oxygen) and state of the art medications and dressings. In some case, wounds are still seemingly impossible to heal.