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Common Causes of Red Eyes
Medically reviewed by Johnstone M. Kim, MD Red eyes are caused when blood vessels in the sclera (white part of the eye) swell ...
Medically reviewed by Christine L. Larsen, MD Eye crust forms when mucus, oils, and debris accumulate, often during sleep.
It's helpful to know that only infectious conjunctivitis (meaning pink eye caused by viruses or bacteria) is contagious.