What can happen to a diabetic that has sores on the foot that will not heal ?

Infection: An open sore on the foot of a diabetic is serious. First, diabetics have more difficulty fighting infection. Next, poorly controlled diabetics can have decreased blood flow to their extremities. Lastly, they can experience poor wound healing. All of these together can create a situation that will require a very aggresive approach to prevent spread to the rest of the foot.

See a doc: Sores on the feet of a diabetic are a serious problem. They could be a sign of infection and or poor circulation. If left untreated they could result in amputation. Sometimes despite everything it still comes down to an amputation to get the wounds healed.

Bone infection: Eventually bone infection called osteomyelitis can form or a spreading soft tissue infection called necrotizing fasciitis can develop. This can eventually produce tissue loss as well as loss of limb and life.

Might need surgery: Chronic diabetic ulcers will end up requiring amputation - need to be vigilant to avoid this.

Diabetic foot sore: Often, a ulcer that is open for an extended period becomes infected. But, because the pain usually associated with a sore is absent, there may be rapid and dangerous progression of the underlying infection. In many cases, this leads to amputation of either toes or part of the foot. In the worst case scenario (short of fatal sepsis), an untreated diabetic sore can lead to amputation of the leg.