Some birthmarks are from extra color (pigment) in the skin. Other birthmarks are blood vessels that are bunched together or don't grow normally. It's not clear why some children have birthmarks and others don't.
a thickening of the cornea may indicate swelling swelling usually occurs from damage to the back the layer of the cornea associated with aging trauma or disease of the eye the swelling can be observed for progression or medically treated with topical hyper osmotic agents
Role of a Healthy Cornea. Your cornea is a clear tissue that covers the front of each eye. Light entering your eye first passes through the cornea, then your pupil (the dark spot at the center of the colored iris), and then your lens. The cornea must remain clear for you to see properly. However, a number of problems can damage the cornea, affecting your vision. Corneal scarring from trauma and infection.