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If it is just a blister and not infected at present- no redness, no pus- then you don't need an antibiotic.
There are all kinds of medicated dressings that would help, but as good as any would be applying a little vaseline to keep the site moist, and a gauze dressing over the top.
If it does develp signs of infection secondarily, at that point it would be reasonable to apply a topical antibiotic.
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