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Hi Dr. Ashori here.
If it's a clear blister with no blood the best thing to use is artificial tears, ideally preservative free.
Use them 5-6x per day.
A cold compress will also help over the eyelid for about 5-10 minutes.
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If you have a picture you can upload I'm happy to take a look at the eye.
Usually not much more than 1-2 weeks.
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