I'm personally in favor of naturopathic remedies when they're effective and use them myself, but I do not know of any peer-reviewed literature that supports placing sugar directly in a wound as a wound care adjunct. There is some literature about sugar dressings but I don't know that that is duplicable with ordinary sugar since it's concentration-dependent and lower concentrations actually have the opposite effect (i.e. they act as a medium). There are better remedies out there that are readily available.
Best regards,
DDM
I haven’t done a lot of research on sugar as a wound management method either, but your fear was my first thought too. Get enough sugar and perhaps there is enough osmotic pressure on the wound to inhibit bacterial growth. OTOH you could just be feeding raw energy to the very infection you’re trying to prevent if you get the concentration wrong.