Adults with black patches on the whites of the eyes may be related to conjunctival nevus of melanin, melanoma and so on. 1. Conjunctival nevus of melanoma: it is a congenital benign misshapen tumor originated from neural ectoderm, mostly occurring at the corneal margin and the bulbar conjunctiva of the eye, with clear boundary. Most nevi are black, a few are brownish-red, with varying shades of pigmentation. 2. Melanoma: most of them are derived from acquired primary melanoma, some of them are derived from conjunctival melanocytic nevus, and a few of them are derived from normal conjunctiva, showing nodular growth. Adults with black patches on the white of the eye may also be caused by other reasons, accompanied by other discomfort, it is recommended to consult a doctor in a timely manner, in accordance with the doctor’s advice and then further relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.