If the redness at the end of the eye refers to the white part of the eye at the outer corner of the eye, it may be related to trauma, allergy, infection and other reasons. 1. Trauma: If the tail of the eye is hit by trauma, it can cause the local blood vessels to expand and congest, or even rupture, which will lead to the formation of blood clots, so that it looks like the tail of the eye has a piece of red. 2. Allergy: If the eyes are exposed to cosmetics and other allergenic substances, it can cause the body to develop abnormal immunity, local blood vessel expansion and congestion, which looks like a red piece of performance. 3. Infectious diseases: such as bacterial conjunctivitis, can also cause local inflammatory reaction, the phenomenon of the tail of the eye red piece. A small piece of redness at the end of the eye, a long time can not be absorbed or accompanied by other discomfort, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, standardized treatment under the guidance of the doctor, so as to avoid delays in the condition of the body to bring about adverse effects.