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Naevus Flammeus – Port-Wine Stain: Causes and Treatment

Naevus flammeus, commonly known as a port-wine stain, is a congenital vascular birthmark causing a red to purple discoloration of the skin. It is usually harmless but can be associated with certain medical syndromes.

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Things worth knowing about "Naevus flammeus"

Naevus flammeus, commonly known as a port-wine stain, is a congenital vascular birthmark causing a red to purple discoloration of the skin. It is usually harmless but can be associated with certain medical syndromes.

What is Naevus Flammeus?

Naevus flammeus – commonly referred to as a port-wine stain or fire mark – is a congenital vascular malformation of the skin. It results from a permanent dilation (ectasia) of small blood vessels (capillaries) in the upper layer of the skin (dermis), causing a characteristic red to purple discoloration. Unlike some other vascular birthmarks, naevus flammeus does not fade over time and may deepen in color and thicken as a person ages.

Causes

Naevus flammeus develops due to abnormal blood vessel formation during embryonic development. The capillaries in the affected area remain permanently dilated because the nerve control of vessel tone (vasomotor innervation) is disrupted. In most cases, the birthmark occurs sporadically, without a family history. It is not an infectious condition and is not caused by external factors during pregnancy.

Appearance and Symptoms

Naevus flammeus typically presents with the following characteristics:

Flat, well-defined skin discoloration ranging from pink and red to purple
Blanches temporarily when pressure is applied (positive blanching sign)
Common locations: face (forehead, cheeks, nose), neck, and limbs
Appears bright red in infancy; may become darker purple and thickened in adulthood
Usually painless and not itchy under normal conditions

Association with Syndromes

In rare cases, naevus flammeus may be part of a more complex medical syndrome:

Sturge-Weber Syndrome: A port-wine stain in the trigeminal area of the face combined with vascular malformations in the brain and eye; may cause epilepsy, glaucoma, and neurological impairment.
Klippel-Trenaunay Syndrome: A combination of port-wine stain, varicose veins, and soft tissue or bony hypertrophy of a limb.
Salmon Patch (Stork Bite): A common, harmless variant typically located on the nape of the neck or forehead in newborns, which usually fades spontaneously in infancy.

Diagnosis

The diagnosis of naevus flammeus is usually made clinically through careful physical examination and assessment of the skin. If an underlying syndrome is suspected (e.g., Sturge-Weber syndrome), further investigations may be required:

Ophthalmological examination (to rule out glaucoma)
Neurological assessment and MRI of the brain
Dermatoscopy for detailed evaluation of the vascular pattern

Treatment

An uncomplicated naevus flammeus does not necessarily require treatment if it causes no health problems. However, for cosmetic reasons or in cases of functional impairment, several treatment options are available:

Laser Therapy

Pulsed dye laser (PDL) therapy is considered the gold standard for treating naevus flammeus. The laser selectively destroys the dilated blood vessels without damaging the surrounding tissue. Multiple sessions are usually required. The best results are achieved when treatment begins early in life, as the skin is thinner and more responsive at this stage.

Other Options

Camouflage makeup for cosmetic coverage
Photodynamic therapy (under investigation in clinical studies)
Surgical intervention (rarely indicated, only for very pronounced cases)

Prognosis

An isolated naevus flammeus is a benign condition with no tendency toward malignant transformation. Without treatment, it persists throughout life and may darken and thicken with age. Early laser treatment can achieve good cosmetic outcomes. When associated with syndromes such as Sturge-Weber syndrome, the prognosis depends on the severity of the accompanying conditions.

References

Enjolras, O. & Mulliken, J.B. (1997). Vascular tumors and vascular malformations. Advances in Dermatology, 13, 375–423.
Jacobs, A.H. & Walton, R.G. (1976). The incidence of birthmarks in the neonate. Pediatrics, 58(2), 218–222.
Batta, K. et al. (2002). Randomised controlled study of early pulsed dye laser treatment of uncomplicated childhood haemangiomas. The Lancet, 360(9332), 521–527.

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