Iris plaques may be caused by iris pigmented nevus, iris melanoma and so on. 1. Iris pigmented nevus: Iris pigmented nevus is a dark brown spot located on the surface of iris, which has different shapes, smooth surface and clear edges, and is usually congenital. Usually in early childhood, the patient’s iris can be seen pigmentation, usually does not have the possibility of malignant transformation, no special treatment is needed, regular observation can be. 2. Melanoma of iris: Melanoma of iris is a malignant disease, the clinical symptom is that there is a black spot on the iris, and it will gradually increase in size, which leads to anterior chamber hemorrhage and elevated intraocular pressure, and the patient can consult the hospital in time and have local excision surgery under the doctor’s suggestion. It is recommended that patients with iris plaques and other discomforts should consult the hospital in time to assess their condition and under the guidance of doctors for standardized treatment.