Birthmarks are made up of abnormal blood vessels in the skin. There are many different types, including: salmon patches (naevus simplex); port wine stains (naevus flammeus); and strawberry marks (infantile haemangiomas). Strictly speaking only the first two are birthmarks as strawberry marks usually appear in the first few weeks of life.
Salmon patches are the commonest of the vascular birthmarks, occurring in one of every 2 newborn babies. They are present at birth as flat, dull-red areas on the eyelids, bridge of the nose, the upper lip and on the nape of the neck (where they are sometimes referred to as ‘stork bites’). Usually inconspicuous, they are more noticeable when the child is crying. Most of them fade during infancy, though 50% of those on the nape of the neck persist into adult life. No treatment is needed.