Diabetes mellitus is the name for several disorders with one thing in common: there is too much glucose, or sugar, in the blood. The body uses a natural hormone, called insulin, to change sugar and other food into energy. Diabetes develops when the body does not produce enough insulin or produces none at all. Or it develops when the body cannot use insulin. People living with diabetes often suffer from other health problems. One complication can be damage to tissue on the feet. These foot ulcers can worsen if left untreated. Doctors may decide to remove the damaged area in an operation called an amputation. In some cases, the patient could die. But a device being developed in Britain could help doctors recognize when ulcers are about to form. Using a relatively simple temperature sensing device, doctors scan a patient’s feet for signs of an ulcer.