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It is likely that you are experiencing the symptom of subconjunctival hemorrhage
due to unintentional rubbing of the eye associated with rupture of one or more tiny blood vessels under the conjunctiva (the white part of the eye). This will resolve with time, and usually not harmful. Other conditions that can cause this includes valsalva such as coughing, sneezing, and/or straining. During the resolution as the blood resorbs into the body, it tends to spread out, making it look worse. This is expected and will clear. It may even take a varied color as it resolves, and that is also expected. To increase that rate of resolution, I suggest that you use over the counter preservative free tear drop such as Refresh or Genteal tear drop 4 times daily for 2 weeks. If you feel and discomfort or irritation
, I suggest that you also use over the counter Zaditor eye drop twice daily as needed for 2 weeks. If this fails to significantly resolve in 2 weeks, I suggest that you follow-up with your eye doctor for closer evaluation. In addition, I suggest that you avoid over the counter aspirin, ibuprofen, or Aleve in the next 2-3 weeks, as this can worsen the bleed. Also, if you are using other blood thinners such as coumadin, I suggest that you follow-up with closer evaluation.
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Please note that this answer is for information only. It cannot be substituted for the visit to or the recommendation of your doctor.