Our expert says:
If a diabetic has an infection their bloodsugar goes haywire even if they eat right and use their insulin correctly.
Maybe ask his doctor if he should not go onto an insulin sliding scale until the levels come down?
Any injuries must immediately be treated by disinfecting and putting antibiotic ointment on it (like Bactroban), cover with bandaid.
It will be good if a wound care sister can keep an eye on his leg as they can get complications very quickly. See if there is a pharmacy with a clinic near you?
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