There is a black nevus in the eye, also known as conjunctival pigmented nevus, which is congenital benign misshapen tumor, is rarely malignant, mostly occurs in the corneal margin near and blepharosphenoid spot of the bulbous conjunctiva, the size of the nevus varies, the boundaries are clear, slightly elevated in the conjunctival surface, usually black, some brownish-red, there is no uncomfortable feeling, and is often found unintentionally. Generally do not need treatment, if the mole suddenly grows, there are blood vessels growing into it, suspected of malignant changes, must be widely and thoroughly excised, and sent for pathological examination after surgery.