Diabetic Wounds and Infection Surveillance

A diabetic foot ulcer is rarely “just a skin problem.” Persistent hyperglycemia damages peripheral nerves and blood vessels. Neuropathy removes the warning system: a pebble in a shoe, a blister, or repetitive pressure may cause tissue injury without pain. Peripheral arterial disease reduces the blood supply needed for oxygen delivery, immune-cell function, and healing. The result is a dangerous combination: injury may go unnoticed, and damaged tissue may not receive enough perfusion to recover. Callus over a pressure point can further concentrate force beneath the surface. An ulcer may therefore be deeper than it first appears. Poor glycemic control also impairs leukocyte activity and favours microbial growth. Once skin integrity is lost, bacteria can colonize the wound. Colonization alone does not equal infection; chronic wounds often contain bacteria without invading tissue or causing inflammation. Antibiotics are not used for an uninfected ulcer simply to accelerate healing. Pressure relief, perfusion assessment, debridement when indicated, and wound protection address the reason the ulcer persists.