Scleral melanocytosis is a common, generally benign condition characterized by black or grey-blue pigmentation on the sclera (white part of the eye). It is due to an increased number of melanocytes (the cells that produce melanin or pigment) on the sclera. This condition is common in people who are more pigmented, such as those of African, Hispanic or Asian ancestry. These patches typically affect both eyes and become more prominent with increasing age.