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 thickness is one of the major considerations that determine if you can be eligible for flap-based laser refractive surgery (LASIK). You may have heard people saying that they are unable to undergo LASIK because their corneas are too thin or not thick enough. Before undergoing any form of laser refractive surgery, you should understand why corneal thickness measurements are essential. LASIK works by removing (ablating) tissue from the cornea.