Hi, Conjunctiva is the white of the eye behind the external scleral layer. This layer of the eye numerous minute blood vessels. It can break easily on increased pressure on these arterioles due coughing, sneezing, even deep rubbing of the eyes. External injury to the eye can also cause subconjunctival hemorrhage. In this condition, blood is collected between the conjunctival and scleral layer. Unless there is any significant symptoms, there is no need for active management. It subsides on its own. Artificial tears can be used in case of irritation. Visit an ophthalmologist, in case of any symptoms. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pradeepraj, General & Family Physician