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If diabetes is not correctly controlled, it can lead to nerve damage in the feet and legs called neuropathy. This means that people with diabetes are more likely to get foot ulcers as they have a reduced sensation of pain in their feet and the nerve damage may mean that skin cannot properly repair itself.
The slightest injury, such as blisters or cuts, can develop into an ulcer. Foot ulcers can be treated successfully if caught early, but if left untreated the consequences can be serious.
Source: NHS choices