A nevus is a collection of pigmented cells similar to ordinary freckles, or a mole, found on the skin. A nevus can occur in several areas of the eye. A nevus on the retina is commonly called a choroidal nevus due to its location at the base of the retina. These common pigmented areas occur in approximately 30% of the population.
Like freckles on the skin, a nevus is benign and is rarely of any concern. Because nevi closely resemble more serious conditions, periodic dilated examinations, and/or, retinal imaging photographs are essential to insure that there are no changes over time.