Blood on the white of the eye with a black spot at the end is usually caused by small blood vessels in the conjunctival tissue penetrating the scleral wall, or it may be caused by abnormal blood vessel development. The blood vessels of the conjunctival tissue communicate with those of the scleral tissue, and a part of the blood vessels will vertically penetrate the scleral wall to enter the interior of the eye, and a small black spot will be formed at the site of entry into the interior of the eye and will be manifested as the terminal end of the blood filaments on the whites of the eyes. This is a normal physiologic phenomenon that does not affect the health of the eye and does not require treatment. There are also some abnormalities of blood vessel development, such as hemangioma, which will form a thick blood filament on the white part of the eyeball, and the blood filament may expand at the end and form a black spot similar to the manifestation. If there is no other discomfort, there is no need to take special treatment for the black spots on the white of the eye. Normally, you should develop good habits, avoid overuse of eyes, stay up late and other bad behaviors.