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Dr. Stan
Dr. Stan, Ophthalmologist
Category: Eye
Satisfied Customers: 2701
Experience:  Johns Hopkins Fellowship Trained, Certified and Licensed Medical Physician and Surgeon
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What would cause what appears to be a small blood blister by

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what would cause what appears to be a small blood blister by the eye to suddenly appear?

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It is likely that you are experiencing the symptom of subconjunctival bleeding from rupture of some tiny blood vessels in the white part of the eye. This is common, and usually not harmful. It would usually resorb into the eye over 1-2 weeks without any side effect on the vision. It is likely that you unintentionally rubbed the eye at night or at any other time, and caused the vessels to rupture. It can also occur after a valsalva pressure including after coughing, sneezing and/or belching. To help speed the resolution, I suggest that you use over the counter preservative free tear drop such as Refresh plus or Genteal tears 4 times daily in each eye for 1-2 weeks. It is expected that the color of the blood may change in the coming days or appear worse as the blood resorbs into the body. If you are currently taking aspirin, I suggest that you hold off from taking it for 1-2 weeks. However, if you are taking other blood thinners like Plavix or Coumadin, I suggest that consult with you doctor. Do not worry, it would go away. However, if the blood presists after 2 weeks, or you experience decrease vision or eye pain at any time, please call and follow-up with your eye doctor immediately.

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