People with diabetes have an increased chance of developing foot ulcers because you are more likely than other people to damage the skin on your feet. This is because diabetes can cause nerve damage, so you don't notice if your foot is injured or sore. Diabetes also causes blood vessel damage so your skin can't heal easily.
About 1 in 5 people with diabetes (20%) will develop a foot ulcer sometime during their life and about 50% of those ulcers will become infected.