Q: I recently had an eye examination and my doctor said that I have a mole behind the retina of one eye. What causes this and how can it be treated? Is it serious?

A:A mole is usually a congenital (birth mark kind of a lesion) but sometimes can develop later also. It can be of two types - Benign and malignant lesion. 1. A benign lesion is to be kept under observation and watched for any tendency towards developing malignant changes (increase in size, colour change). 2. A malignant lesion is serious and needs treatment urgently in form of (radiotherapy/chemotherapy/excision).