Which of the following is NOT an early symptom of a diabetic foot ulcer?

The reasoning behind this choice being the correct answer is centered around the typical characteristics associated with early diabetic foot ulcers. Redness that fades over a few minutes typically signifies a transient condition, possibly related to circulation or irritation, rather than a consistent or persistent symptom of a diabetic foot ulcer.

In contrast, early symptoms indicative of diabetic foot ulcers usually include persistent pain in the foot, which can reflect underlying tissue damage. Swelling in the localized area also serves as a key warning sign, pointing to inflammation or infection that may be occurring. Additionally, changes in skin temperature are relevant, as increased warmth may suggest infection or increased blood flow to the area during the inflammatory response.

Therefore, redness of the skin that resolves quickly does not align with the chronic nature of diabetic foot ulcer symptoms, making it the option that does not fit with the others.