Whereas a bruise typically appears black or blue underneath the skin, a subconjunctival hemorrhage initially appears bright red underneath the transparent conjunctiva. Later the hemorrhage may spread and become green or yellow, like a bruise. Usually this disappears within 2 weeks.

  Although its appearance may be alarming, a subconjunctival hemorrhage is generally a painless and harmless condition; however, it may be associated with high blood pressure, or trauma to the eye.

Causes

• Minor eye trauma
• Spontaneously with increased venous pressure
  • Coughing
  • Sneezing
  • Vomiting, particularly forced vomiting as seen in       bulimia nervosa
  • Straining
  • Severe alcohol intoxication, leading to raised
     blood pressure
• Blood dyscrasia (rare)
• Severe hypertension
• LASIK
• Blood thinners, such as ginger, capsaicin, ginseng, garlic, aspirin or ginko if taken in high doses or combined. These can also make the vessels in the eye more susceptible to the pressure causes listed above.

  Subconjunctival hemorrhages in infants may be associated with abuse or traumatic asphyxia syndrome.

Treatment and management

  A subconjunctival hemorrhage is typically a self-limiting condition that requires no treatment in the absence of infection or significant trauma. The elective use of aspirin and NSAIDs is typically discouraged.