In general,: a gray shadow or mole located at the back of the eye is a choroidal nevus or congenital retinal nevus. These are almost always harmless. But a skilled Ophthalmologist is needed to take photographs or record the characteristics of the shadow or mole so it can be monitored and tracked. Very rarely this might be a cancerous mole or melanoma. Complying with this protocol is strongly advised.
Answered 11/6/2020
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