Black spots in eyes may be related to conjunctival pigmented nevus, conjunctival malignant melanoma and other diseases. 1. Conjunctival pigmented nevus: Conjunctival pigmented nevus is a kind of congenital benign tumor, mainly due to pigment deposition caused by pigmented nevus, this kind of pigmented nevus is usually accompanied by different bumps, but it usually does not affect the eyesight. 2. Conjunctival malignant melanoma: it is a kind of disease mainly caused by the malignant transformation of conjunctival pigmented nevus after stimulation, and the patient’s eyes will have black patches and other manifestations after the symptoms appear. In addition, hyperpigmentation of the conjunctiva will also lead to black spots in the eyes of patients. Patients with this condition are advised to consult a doctor in a timely manner to investigate and clarify the specific cause of the condition.