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Thank you for the question.
The water blister might have appeared because of vigorous rubbing of the eye. It does disappear within a few days but can sometimes take more than a week or two to disappear. However do conault your eye doctor if it persists beyond 2 weeks as it might require start of anti allergy eye drops along with non steroidal anti inflammatory eye drops. In the meanwhile you can use artificial tears eye drops to soothe the eye.
Thank you and best wishes.