What is a Diabetic Foot Ulcer? A foot ulcer forms when skin tissue anywhere on the foot or toes breaks down exposing inner layers. It can involve the entire thickness of your skin, including deep structures such as tendons or bones. On the other hand, it can be redness or a shallow sore that involves only the skin surface. People with poor circulation and diabetes patients in particular, are at a higher risk of developing foot ulcers. In people with diabetes, foot ulcers can be difficult largely because even small foot ulcers can easily become…