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Stork Bite – Causes, Appearance and Course

A stork bite is a harmless birthmark in newborns, appearing as a reddish patch on the neck, forehead, or eyelids. It usually fades on its own within the first years of life.

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Things worth knowing about "Stork Bite"

A stork bite is a harmless birthmark in newborns, appearing as a reddish patch on the neck, forehead, or eyelids. It usually fades on its own within the first years of life.

What Is a Stork Bite?

A stork bite (medically known as naevus flammeus simplex or naevus teleangiectaticus) is a very common, benign skin marking found in newborns. It appears as a flat, reddish to salmon-colored patch caused by dilated, superficial blood vessels beneath the skin. The popular name comes from the fairy-tale idea that storks carry babies in their beaks, leaving pressure marks behind.

Stork bites are among the most frequent skin findings in newborns, occurring in approximately 30 to 50 percent of all babies. They are completely harmless and require no medical treatment in the vast majority of cases.

Causes and Origin

A stork bite develops due to the temporary dilation of small blood vessels called capillaries just beneath the surface of the skin. This dilation is present from birth and is linked to immature vascular regulation in newborns. It is not a disease but rather a normal developmental variant.

Caused by the dilation of superficial capillaries due to immature vascular control
No clear genetic cause has been identified, though familial clustering may occur
Not associated with complications during pregnancy or delivery

Typical Locations

Stork bites tend to appear in specific areas of the body:

Nape of the neck (most common site, sometimes called a neck birthmark)
Forehead and bridge of the nose
Eyelids (upper eyelids)
Occasionally: back of the head or lips

Appearance and Course

The mark appears as a flat, reddish to pale pink discoloration without any raised surface. A characteristic feature is that the patch temporarily lightens or disappears when pressed with a finger (a phenomenon called blanching on pressure). The patch may temporarily deepen in color when the baby cries or becomes warm.

In most cases, stork bites fade on their own during the first one to two years of life. Those located at the nape of the neck tend to persist longer and may remain into adulthood, though they are typically hidden by the hair.

Diagnosis

A stork bite is usually diagnosed through a straightforward clinical examination by a pediatrician or dermatologist. No special tests are required. However, it is important to distinguish a stork bite from other vascular skin changes:

Port-wine stain (naevus flammeus): Appears darker red, has sharper borders, and does not fade over time. It may require further evaluation and treatment.
Hemangioma: A benign vascular tumor that develops in the first weeks of life and may be raised above the skin surface.

Treatment

A stork bite typically requires no treatment. Since it is harmless and usually fades on its own, a watchful waiting approach is recommended. Parents should be reassured that this is a normal and very common occurrence.

In rare cases where a facial stork bite is particularly visible and does not fade, cosmetic treatment with laser therapy (e.g., pulsed dye laser) may be considered. This is not medically necessary, however, and remains a personal decision made by the family in consultation with a physician.

When to See a Doctor

A stork bite is generally harmless. However, parents should consult a doctor if:

The patch does not blanch (lighten) when pressed
The mark becomes darker, larger, or raised
Additional skin changes appear
There is any uncertainty about whether the mark is truly a stork bite

References

Altmeyer, P. (Ed.): Enzyklopädie Dermatologie, Allergologie, Umweltmedizin. Springer Verlag. Section: Naevus flammeus simplex.
German Dermatological Society (DDG): Guideline on Vascular Anomalies in Childhood. AWMF Registry No. 013-092.
Sterry, W.; Burgdorf, W.; Paus, R.: Checkliste Dermatologie. 6th Edition. Thieme Verlag, Stuttgart 2010.

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