What Causes a Large Blood Spot on the White Part of the Eye?

By Staff WriterLast Updated Apr 15, 2020 10:10:52 PM ET

A large, red blood spot may appear on the white of the eye as a result of a broken blood vessel below the conjunctiva, the clear surface of the eyeball, explains Mayo Clinic. It can happen from coughing or sneezing and is called a subconjunctival hemorrhage in the medical community.