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
The substantia propria (or stroma of cornea) is fibrous, tough, unyielding, and perfectly transparent. At its centre, human corneal stroma is composed of about 200 flattened lamellÃ¦ (layers of collagen fibrils), superimposed one on another. They are each about 1.5-2.5 Î¼m in thickness.