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
Initially, fluid collects in the stroma of the cornea, the middle layer of tissue that comprises most of the corneaâs thickness. In advanced cases of corneal edema, blistering can emerge on the corneaâs epithelium, its outermost surface layer.bnormal swelling of the cornea is more likely to occur in people 50 years of age and older. Early symptoms of corneal edema might include blurred vision or haloes, often in the early morning.