Diabetic ulcer. Most diabetic ulcers are actually caused by pressure. Treatment of such ulcers is primarily reducing the pressure at this area thus allowing the body to heal the ulcer.
No direct pressure! Diabetic ulcers will generally heal if you offload the area (decrease direct pressure with an insert, or a wheelchair--no direct pressure!), have your doctor trim the callus and dead tissue away on a regular basis, and if the ulcer is infected, you may need oral or IV antibiotics, depending on the severity of the infection.