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
Corneal pachymetry measures the thickness of the cornea. Alternative Names: Corneal Thickness. What to Expect. 1  Topical anesthetic (numbing) eye drops are administered. 2  An ultrasonic probe is held against the cornea and several readings are taken.